Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bd3099306dfcc88…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 22:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ee03acd9c0b23e0ab8340aaa3eb70fc SHA-1: 3c422d0e79766f510a3ebe12d9f5041e0f318636 SHA-256: 6bd3099306dfcc88164744a2e10646483cad6b63d5147cf249774385b13e1103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to exploit users via embedded URLs, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://feng-shuiworld.com/userfiles/file/53651650305.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609280d529753---xibepogexinuvofebuben.pdf
    • https://alyosserspneed.com/userfiles/files/19784348306.pdf
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/16670542440.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160714336be05f---47821253550.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/4gqio6sqgotmplv69ts9ish93q/jefibifedigabagepe.pdf
    • https://aspirans.com/files/file/bidofazufoxazefomiv.pdf
    • http://chinocorporatechallenge.com/clients/6216/File/31408367885.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609164276307e---10369416364.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/050a8f531ae3002af37924db686c2e17/16733878798.pdf
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073761e8ea62---xeperosujolano.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443a345eee---jovutofum.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3271053a2eb2cfd1a237fe0679b84d59/zapilazapibizigufew.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/fac2f77a5f1497f7cebc3cb3a54cb1b6/dumigaxibuvurumarupow.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a327c507b7---wuvij.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16085905b1faf3---gujasabovunutijut.pdf
    • https://fceresources.com/ckfinder/userfiles/files/mokesifofijakefolalib.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41aa7671e---58159338950.pdf
    • http://atonoserver.com/userfiles/file/basometijog.pdf
    • https://alihuata.com/userfiles/file/jajozebi.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a92f444d418aa061b418a4cd61186d4c/sewoseralogajawolijovi.pdf
    • https://wegofa.com/userfiles/file/49154624767.pdf
    • http://nedirajtebosnu.net/userfiles/file/55408954207.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+defrost+meatballs
    • 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_off0000ed86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16792 bytes
font_01_sfnt_off00010598.bin
ab3e015758d64ca420acb9694bbb6150c2c5160bf5aa168da8da25cb1c0981af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10598 17368 bytes
font_02_sfnt_off0001328a.bin
292dad607a23fe7a070ecb279be04031c0c8914b11b7b4e22df38d7deba33a75
pdf-font-stream PDF embedded font (sfnt) at offset 0x1328A 10536 bytes