Malicious PDF — malware analysis report

Static analysis result for SHA-256 64fa3de417b5448e…

MALICIOUS

PDF

96.8 KB Created: 2021-09-02 00:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aae48254a68047108038304b0c9b9790 SHA-1: c012426d4fc63a7f53ee9f8e56559a3b9737ea85 SHA-256: 64fa3de417b5448eeb24bdb72b8f8d97380740b047c4106db1d8c586e4aa0f06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classification and ClamAV, indicating it's a phishing or trojan PDF. It contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • 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://kazuma.ru/ckfinder/userfiles/files/nurivuxupera.pdf In PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/68541e25e644e92415617501c73afdfc/15009485909.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160e3e04dcbd06---bikoper.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073546e2d04e---derazureruno.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/21292384203.pdfIn PDF document text
    • https://elmaga.lt/components/com_mijoshop/opencart/image/data/files/23925551075.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bd9553200---nomafiforopedawebuj.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b356c78e4b---zataligiwurasumepusetite.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/3959781877.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb33985bd0---78013852064.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/kobovajafanalofosiz.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/98942830748.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/32baa1b8a44f73241ac026ef3e59e709/37375230795.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/17809360236.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8df5ed4e3---zeguvegitepatejolevi.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/rilobujazufekumopikororur.pdfIn PDF document text
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/14708039243.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c8598d7e9---benabekujurotazifuser.pdfIn PDF document text
    • http://casaalu.com/luutru/files/86426920688.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16081621d80dde---bovujutivorekevoz.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/najal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fallout+how+to+hackPDF 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_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D26 9988 bytes
SHA-256: de5481fbd5416b73a1943f128ca762b1e05827e043258d73f512780c3f20a8cf
font_02_sfnt_off00014382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14382 19312 bytes
SHA-256: 1ffb782df0536dcc5605438c4eb58a7e3c85bd32fb92dcb01f4712989d19ce51

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