Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5036c31f636ab0a…

MALICIOUS

PDF

81.1 KB Created: 2021-05-26 23:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00bdca240041842c38432c6ce8505c5c SHA-1: cad2050d70143c35de258ac74c6d8545cc8107d0 SHA-256: a5036c31f636ab0a29972862c7396c788509898ba089a015eaa3709146c20756
156 Risk Score

Malware Insights

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

The PDF file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute further malicious content. The document body, though heavily obfuscated, contains text related to an encyclopedia, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://bmw-zona.ru/uploads/file/69780688945.pdf
    • https://condominiovillage.com/userfiles/file/pature.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077d71c7b21c---tivowo.pdf
    • http://sacoorhealth.pt/site/upload/file/jovaxuferozaxoruvumezo.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7151a261---27795797148.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e5d087f61---8136126171.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c1df5d37c---nelanezokigiturusonob.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/b964b383f0e0beaa4c815ee97f883b1a/38144982584.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2a69aa06c---99532093614.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/srv5msabds26igkcfov78siorr/8265775357.pdf
    • http://nappsa.org/userfiles/file/jalire.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822b12e0fc3---8338250534.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/m6bv42fi1h196lndijol38q4v8/giwakopowud.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/585ebeeda47e9c22cb4da4f2dda0c924/3557704887.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a7771d21dd5---joganivowesujadusa.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/35d3d3a8b7675434307aff802053cde3/gupebelafeb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=world+book+encyclopedia+2019+pdf
    • 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_off0000fb9c.bin
525419070eaf2f8608eb6b7352cd23d7394157510b23155a076e037f9b0f132a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 5772 bytes
font_01_sfnt_off00010f6a.bin
233e5359ca35f2960dad28da3121d6b0dd516b8f4f442f942c1630bb523a9319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6A 11712 bytes

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