Malicious PDF — malware analysis report

Static analysis result for SHA-256 b306140679a1211e…

MALICIOUS

PDF

82.3 KB Created: 2021-10-08 03:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 052d0b05fe2d68552d6c6f9699caf486 SHA-1: aefad201818e4300e01e72442cb06499d4997ffe SHA-256: b306140679a1211e19f144d20cad65ad552b76e518357206afaca29204ab0f73
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://vivaldiskibus.com/FileData/ckfinder/files/20210901_7F5D04E61FA9C5E1.pdf
    • http://canadapremiumlubes.com/survey/userfiles/files/dafud.pdf
    • http://getsolarnj.com/userfiles/file/rupaxejoganemosigenufol.pdf
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/50702133308.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/04f84577bcf61055f7448a7c7d60fea1/77724159121.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021092904563273499.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6dddeced3---14566944223.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/823a000a9cad5a987b497f9c46534ef7/lolinurasesejirozozu.pdf
    • http://acril.ru/ufiles/files/34587438140.pdf
    • http://clinicaveterinariagoitese.it/userfiles/files/lagogevarebigidoledoki.pdf
    • http://mynigaoe.com/upload/file/20210910054158.pdf
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e223c78dd---lugip.pdf
    • https://maychieuvinh.vn/upload/files/rosimofibo.pdf
    • http://loaamtran.vn/files/usersfiles/files/90660212545.pdf
    • http://chinazzjx.com/d/files/14538037173.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/pqkmimid7e07j6o1e0ercud9a1/49394742616.pdf
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/vezom.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/ziwumatetegisixadofirab.pdf
    • http://dongbanja.com/userData/ebizro_board/file/20418049031.pdf
    • http://askort.pl/Upload/file/gepozonerimerazuxares.pdf
    • http://nghiencuuykhoa.com/uploads/userfiles/file/jodovobamer.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=appearance+vs+reality+twelfth+night
    • 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_off0000db5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 16792 bytes
font_01_sfnt_off0000f373.bin
2214fda2305beff1034abb82dd7d345cb8ba53197e809183dd44896fda724155
pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 10884 bytes
font_02_sfnt_off00010caa.bin
3df75ada6f3e7c19a45bbe62716b64cf0a7a0933025b8f35de11ea3c06031681
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 18184 bytes