Malicious PDF — malware analysis report

Static analysis result for SHA-256 79dd189e3bd0624f…

MALICIOUS

PDF

92.5 KB Created: 2021-09-04 11:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 7eb1c8b2b1c52acbc5ee0c68a55d70f4 SHA-1: 8f442bbf272c1386e058f796bea30363fe4f0b7b SHA-256: 79dd189e3bd0624f136639fe8d40a8c07a730ed9adda1293031484add7e2e97b
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of 'LOLBin token sequence in document text' further supports the attack pattern of attempting to execute commands or redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gdaniec.com/upload/files/98312227618.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ce2996b4---bapolopesebajirupavas.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/jenibakanofutuwekafudu.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/59177630537.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/152c2d9ff6f3760a55de0fe135bb18f1/tuzavijaf.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/bujapojokivat.pdfIn macro / runtime command snippet
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f53959de824af7b894dd3913f113fbae/mabuwuxotelolufir.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/91051238558.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pupixexafebofim.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160845d22d8126---32912214971.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/69993694392.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac77c9d95f---buravok.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/fafagafijivobezilepeb.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e558f41338e---xapunomodagojisa.pdfIn PDF document text
    • http://maidichike.com/upload/files/dowisasiwilazuvu.pdfIn PDF document text
    • http://insei.eu/userfiles/files/fetudubaje.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bacab732624---valurutozibupiw.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/64400686263.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f611db642---15946102028.pdfIn PDF document text
    • http://ambulatorioveterinariorigolon.eu/userfiles/files/77819364752.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/xolelorobese.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68d983bfa2---57939828921.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/a542473abf0df8239116cd0f9759b708/27530074539.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/oslgtum5qjmi6mai065bc1omg5/10496266852.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609c243bd96a7---585531773.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd924160ccb---pavuwipimurigoze.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/julitefe.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/40196073226.pdfIn PDF document text
    • https://adbadog.com/wp-In macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=leprecon+lp-x24+manualPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEA 16284 bytes
SHA-256: db88aa309b658614a38a459362a1412611d4fbcacab0fdce1882d57bc04e3c99
font_01_sfnt_off0000f421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF421 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 25268 bytes
SHA-256: 16097f5e67fa429c10ede24669e3c4f0543008dcc8afa716132a267129ca2405
font_03_sfnt_off00014b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B92 10568 bytes
SHA-256: 3ab05bf6bea41ee81ad4a508e8fb44df7b7a64a93cef5b03e20d94bd1292bf40

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