Malicious PDF — malware analysis report

Static analysis result for SHA-256 84a6d9042df7bd48…

MALICIOUS

PDF

75.1 KB Created: 2021-07-05 05:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e41c29cb805532746eaa41f9f2cb4fe SHA-1: df3b0158da3b98319414181e29201e9e7f8053ca SHA-256: 84a6d9042df7bd48633021e2a3c198960f1b6834340e0445976d38894f66543c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7611

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • 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://tevukasveza.lt/ckfinder/userfiles/files/69175537892.pdf In PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/b4i2rl3e9b4igi38pn3f9cnbv3/84416630417.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/65685330738.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210530_557A5AF6D2300D62.pdfIn PDF document text
    • http://valifyrepapillon.com/clients/6/68/68e1c6a84db99a04c21676ff826d6e37/File/gedikegipojebepi.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/nexamuzumixovivozare.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/pajori.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850f02191ec---zulakonif.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160804478b9019---tutedavejawos.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/fnphsog8864niapvotdltqeq1h/17706496117.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608de56fb46e6---26869242724.pdfIn PDF document text
    • http://prosquash.by/data/42495436888.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4a006edbc---8066143264.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/009bb2a95008cfc95b132ba255457037/64221217407.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5f10eee34cbef4e7633e4b6ec6b82e41/89784099942.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/kelafufulawerix.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b170514976f---popitunokagopelis.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/25035958808.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c2ba1dc77efcee777a471e40b7ddedf/56119452270.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56c4f67594---46559880061.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/fae4c0e8f46d151164c1a30c502bec71/dalifudafuzofoziwoz.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mjnp9hrpr6f5dbn28m0peasm86/tonosexorofofetadugaw.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/3116214029.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=the+prayer+father+daughterPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 10424 bytes
SHA-256: 9a7a80b66d8a4b96b8f4c38621462a2a4c7f08e759725be787a5edfc4abd0f81
font_01_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 17668 bytes
SHA-256: 63da9dd7a76c9c7f43f3d6cbeeeb7148e53684dd5494831781a22bc3d1d86d7f