Malicious PDF — malware analysis report

Static analysis result for SHA-256 efa80c218bcce116…

MALICIOUS

PDF

85.4 KB Created: 2021-09-17 23:02:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 641fe472fbd03b9628d009e588c9c28f SHA-1: 8af5c7b7536b10f96a58893085ccfb4cc2887387 SHA-256: efa80c218bcce116fdb4a8dd1fc800e2be4f3d78ca2a0aa105908bc0159df39f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://aczv.fr/userfiles/file/ranominagawamojadufuz.pdf In PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/3885649358.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/23625589137.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/8td4tubd7olpvtn08d2cphonq5/rawibijawuzubelumig.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xedaviwuwefezili.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/mubidegijukojizetiti.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/c53a839db058281cb06c5d8a04c7bdf1/zomuxelejavo.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/zekosifemazaxiloroxuno.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/98117654055.pdfIn PDF document text
    • http://mikol-styl.cz/userfiles/file/62695041188.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/94972779478.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/65389472560.pdfIn PDF document text
    • http://cpils.com/userfiles/file/vatenepukenajudutizof.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/1dbbe18aad4ef80282d4af5dc89c80bb/xusobozukubide.pdfIn PDF document text
    • https://afayl.com/userfiles/file/vetoferenu.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/nunulevinokiximop.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/23485647267.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/bejazam.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/soxefagozuxevugonaveziwe.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319bf52e3c8---xosalaroviwifi.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/lolejagud.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/fbe422f623fd426d0d731c881f0d89f4/worololam.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387f0f6bc26---17780452416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=among+online+gamePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA40 18272 bytes
SHA-256: c90eb623667a32d43798f182eb6a0f94cc35d7e1236a8a4ef948a2a706e5ca67
font_01_sfnt_off000119d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 10064 bytes
SHA-256: 89e0cce1e14ce2481ff94e07a88e95219074d0484c72e32d374e0309cd9eb5cf

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