Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6906b8c93d7851b…

MALICIOUS

PDF

112.8 KB Created: 2021-06-25 17:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 206fd7d1b5d81f18112b07ef5ccf261d SHA-1: 44a5b90d840ba28db785ff6eb99248964eb9fea8 SHA-256: a6906b8c93d7851bda242f00fa42702cb01432ed60d794ae81996e062f8a3b0f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It functions as a link farm, directing users to numerous URLs hosted on compromised WordPress sites. The presence of multiple external URIs and link farms on disposable or compromised hosting indicates a strong likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/uplcv?utm_term=wow+warrior+protection+rotation
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d61f71a98---18218106976.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607861dba729a---42971554220.pdf
    • https://hohsingfiber.com/ufiles/files/dilufumug.pdf
    • http://progfin.pl/userfiles/file/12541878846.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c84a161e32---8511736674.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087ee372e376---21907850679.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/rtcspcrriqb588f4e8esetlls2/93093600215.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0cd62b8587ed0fbd214bd577fe2cb734/97756340654.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072396958455---69258539255.pdf
    • https://susta.vn/userfiles/file/vitubopepewore.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfccd06967---85908501591.pdf
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949df9e537d---sokupow.pdf
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/54378502312.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8117bcc75e41a2dfe925aa084c47fa38/9258154485.pdf
    • http://roxburyhs1987.com/clients/63080/File/zefasiwolujivi.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0fef771fbf6948bd97bceee3c301e9a4/14613034382.pdf
    • https://webtechnocrats.com/upload/file/22990243799.pdf
    • https://diaochue.vn/userfiles/file/josedorusavaxatumareninij.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://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_off00015e2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15E2B 16792 bytes
font_01_sfnt_off00017642.bin
9a40b1fdd9e2e0b57ff6b2c8fbffc1d5c7236b5813c4b1993adc2b166314481e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17642 10232 bytes
font_02_sfnt_off00018d64.bin
71583accf63b517bbfc6ef3316668f643df9b2877d0f23c1045060909577d669		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D64 15900 bytes

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