Malicious PDF — malware analysis report

Static analysis result for SHA-256 6925452a34003260…

MALICIOUS

PDF

91.7 KB Created: 2021-07-03 09:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3ef7f825e892b0ce324852156ffd49a SHA-1: a3564c36545dd38fc1cf9ccc91abc264e0a231c1 SHA-256: 6925452a340032607f3f44abd2a7a6f1a2d9c844be900462039f274925ee2472
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://asokmontridental.com/userfiles/file/juximojagozikigugezus.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/f183a7412f35eb32e18adc68a51e4cc3/kupesekoneguvutoxakafez.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/of1f056fdcpv1bcnfv097aub41/pubulamupudofudu.pdf
    • http://gancza.pl/userfiles/file/79017959382.pdf
    • http://www.aadhar-interior.com/userfiles/file/365756664.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/69dd51ce789eede2fdfe8940a36ce529/25685507316.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6e4d24363d70506435ea67397b2cdd34/nutefi.pdf
    • http://baggiez.net/userfiles/file/55048012924.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/m8a2c9eo3u98tsmukhko69koc4/42961611887.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/21929130422.pdf
    • https://produktybhp.pl/pliki_user/File/62548561324.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/42804abf465d35a51b09ddfc132a2dd9/rimilejedofiwatem.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072acb0c7ce9---vezixonajiwirebosigob.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/560d14b7be07670a6f61cc115e3fa100/64034645534.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/8d6b735510d645f21fef270e5e87e075/tolenop.pdf
    • http://gilendor.cz/userfiles/file/74799894063.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/p204artpinl6edta0kgcgfi7ci/nurepawoworavo.pdf
    • http://apexnepaltravel.com/userfiles/file/zakive.pdf
    • http://princeworldwide.com/multimedia/userfiles/file/jegosakijuze.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/189b90b04665cd9f298cc3b1aec10083/mikatazakizepadabi.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e6b1b6eaa---kugarisukawaregamorog.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092731381c19---beketitivafud.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0959ebb970---bedigegisorikodefu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=best+websites+for+cc+sims+4
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010472.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10472 16792 bytes
font_01_sfnt_off00011c84.bin
6b2248b77ab37a16dfa7b1058b9845503785ddae3541ea16edb1545fbc6b3758
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C84 16844 bytes
font_02_sfnt_off00014816.bin
dd7f5df33d93e7d60c5b17b6b5bdbf7fa32c9379067838c76db7ff9d80a36a6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14816 10540 bytes