Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a1c45b5bded34d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-07 22:29:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f5368dfb6168759451dd42be72c4d8d2 SHA-1: 61d5cd42f2b74520f3ae9d4e43026cc566145a1d SHA-256: 92a1c45b5bded34dfaff9998bf674c09386381fb72fa2c3f0f657e67b72398b7
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm pointing to compromised WordPress upload storage and disposable hosting. The presence of 'cmd.com' in the document text suggests an attempt to execute commands, likely to facilitate the redirection to malicious URLs. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081a44774c7b---87440169517.pdf In PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/pixidim.pdfIn PDF document text
    • http://qdcmd.com/data/files/83071115454.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ebeb7f400---zetiz.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/xokijaripijevofuv.pdfIn macro / runtime command snippet
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/0348de4d7cebdd4128d107b83b3b80ed/watuwap.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3cfd7ea6c---77702237082.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/getefuxe.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/15ac41bba33d0e552bc43ef24d75605e/91054481635.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/teraleru.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/67989591753.pdfIn PDF document text
    • https://ciar.vn/uploads/image/files/18239877167.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/xositeropuk.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/jojiwetisukoravarevuxog.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/zokefawer.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ab8ccf0e4db94cd2b78adfbf1224c379/92746248448.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/vrdkq78eu0um8s77vkrktfm45d/kenopekixepefela.pdfIn PDF document text
    • https://priscar.com/documents/files/xalelawamesakukoxu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/59273633301.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/24208791332.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c24769719---73186072751.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b698e93c1ad---84373789043.pdfIn PDF document text
    • http://maxitelt.no/wp-conIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tcpdf+image+file+pathPDF 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_off0000d545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD545 19032 bytes
SHA-256: 82fe0359f6858d936a5b5ed5547044f2ffdbb693d7ffe1d829503f02a3c23a24
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 10536 bytes
SHA-256: 96d5db14ab189667679dc9760da3d750721881d8b7d1280dcc368eacbf2f707c
font_02_sfnt_off00011f42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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