Malicious PDF — malware analysis report

Static analysis result for SHA-256 747df4d8da7e9f22…

MALICIOUS

PDF

79.7 KB Created: 2021-06-14 15:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 901621c5c3f065ef8e786e1523a8ede6 SHA-1: 4ddfc5ad34b527af0103449b3bacde57b8914a56 SHA-256: 747df4d8da7e9f22153bfc283bda240c531b1ced24aaf70bc95081f8839eed80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings and URL patterns are highly indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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 https://allytemp.ru/uplcv?utm_term=density+column+practice+worksheet+answers
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/f5bfa92e0b5850e9ccf575dda2659e53/rafakoroxovazejiwulugovep.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/918107fc97854d8184a866211a95a9a0/56552010673.pdf
    • http://www.anclupnapoli.it/userfiles/file/jatuw.pdf
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/q0earledjciulr3a8b6n8bqqtv/72462675700.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aee16875096---penej.pdf
    • https://carlojans.com/cms/file/serivefitovasiwar.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/ef63bfd70391939eed52988fed110f89/mivoxufugonokenoza.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f31f02b88d---betalawenexedadulesi.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160827229e0716---49863610860.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/l0u65tb420fh39apghqimksfi7/puwibovisubejidedebobeler.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac81da929e2---zetesa.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/tg8i2u9locbr49t9p5re3erbsi/minogerib.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609030492e9f0---32809459936.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/423605c9ee57fe96f2f98c53e06121e8/vopadanaf.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c281e00faa9---47387590285.pdf
    • http://wittlich-luexem.de/userfiles/file/lederejomunukovelu.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160934c971c6f2---81297442372.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/172c1d3ce4b3d7e866ea8ed3f1fcddfb/pomil.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/903b70bb392d913b02cd86be465b4fa9/tozidozisimavax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa94.bin
6c0ab6c55ba4893db176e1e1db149029c234261e1d72dd8c249b53c4f55d8b6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 5428 bytes
font_01_sfnt_off00010cfe.bin
fb5804d79b6de251f19a7cb72ac3f56f670c082635f748410888fea13af71005
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFE 10660 bytes