Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e66a15258521fac…

MALICIOUS

PDF

85.3 KB Created: 2021-07-03 22:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 21598957704181f880da74adf6ecc9b5 SHA-1: 034f002c2cdf2af6e83bcd78d7cbb63d8126cc5e SHA-256: 8e66a15258521facc25aa0aafb69052d06fcfd8a90886725f892d20d50f5fa46
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and the ML classifier gave a high confidence score. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution attempt. The document body is unreadable, but the heuristics indicate a malicious intent through the use of these compromised domains.

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 http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/488396eae5315adfc640cf4691a141e9/53162459038.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/p2sed7llmbtjknh7j2o1ebobpn/xufolosozem.pdf
    • http://goldmustang.com/files/files/rixinowobizibamomaloxo.pdf
    • http://tksvolga.ru/userfiles/file/netaga.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16091569d6b3b4---tujusukiv.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/22500461219.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/cbvmo09r77an0qiramgfnfa0gu/rekimafebarukam.pdf
    • https://moveo-sport.pl/userfiles/file/91542265263.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/atqmtlkvfbtps1mh1kva749l5n/33788397282.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160931d305538b---sebarimurarefofazis.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/uammsqrtj5vce1q4j71bkbv7f5/gajirejane.pdf
    • http://acril.ru/ufiles/files/gexipetujilez.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/uellouqk6nb948a8rqdg4iputi/49036754013.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c2496a2e3---muvuw.pdf
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/kadidawepulef.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=separation+anxiety+worksheets+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_off0000ea05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA05 16792 bytes
font_01_sfnt_off0001021c.bin
80a2ce6a9aa239215000443c3c1d8e5e938d8d345277f82aa39f22d8669535b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 11016 bytes
font_02_sfnt_off00011bba.bin
a147590762e0e3bde3836cee5d1eb5a90417531894cb675a8a9e5adbad03ba37		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 17228 bytes

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