Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c38e87fe2445e31…

MALICIOUS

PDF

89.6 KB Created: 2021-07-08 03:59:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aed43872c5415e129be87796be49777 SHA-1: 723456caf95998336aece04d88ac027ba0c3a05b SHA-256: 9c38e87fe2445e31693ceb9582e0f0d160feebd0985909c7bc13d75b6b9f5ff8
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories, indicating a link farm or redirection scheme. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of external URIs and link farms suggests an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mrp40t6jlol7uuvrolhg3o4f22/limomi.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160838a7bc303a---67850540160.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e31dba656---patije.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/17423e275703513af16143c064297e3f/nenakapekupogabibidofon.pdf
    • https://maturana.cl/upload/file/18547054000.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f980ed6748---pudirebi.pdf
    • http://flygarfield.net/userfiles/file/wixazonidomaf.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4237b614ee---korafagidu.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b0dd37a027f1c85f6e87d0f7b4be35e9/zuped.pdf
    • http://av-jet.ru/userfiles/file/jezubogofevigebelojidiza.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/rvida926j148707str8v4omtgq/70693485916.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80fbc0fdf1---gamatamitojevumetinizame.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/7ea2a5fdec45a716a000adbda6f7fa48/57730238323.pdf
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/mezoniwisa.pdf
    • http://jamesirvinewedding.com/clients/f/f9/f947a18657f5d77a8fcd192ffd4ccf25/File/tafirami.pdf
    • https://dianthusindustrial.com/resimler/files/sulivujaxusuxumevakawur.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d592e7642aad7616ee43e00380a6c066/63869902240.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/5757d562d1eb3cb20f07147385899663/31356080297.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/b8f285f424826a03c577164ab183ac66/13491356528.pdf
    • http://accessiblevehicleservices.com/userfiles/file/64653251149.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe056e968b---12379275485.pdf
    • https://ewt.cz/res/file/48446235928.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/ddb4edd3fe90fb3705ef3284eae5ced1/bapapi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=cry+the+beloved+country+chapter+14+summary
    • 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_off0000f9cd.bin
ab84ca056aa3188bb49e2f8d35fb8d1ca966b11ef6bdb0ce97e61f853d0178b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CD 11268 bytes
font_01_sfnt_off000113fb.bin
e5efea67aa5d0ccf5cdac99eacc9963d7065160c96a109a93ab3c9f938c6c628
pdf-font-stream PDF embedded font (sfnt) at offset 0x113FB 17224 bytes
font_02_sfnt_off000140eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140EB 16792 bytes