Malicious PDF — malware analysis report

Static analysis result for SHA-256 b231474d5dd944c2…

MALICIOUS

PDF

81.6 KB Created: 2021-09-06 19:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f53e32642d909d0ab3504dda31d2a1d SHA-1: 3c4eef5355db914e6df7881e56e28ca2b3b21dbe SHA-256: b231474d5dd944c2cc6a61d0d11f2ae81f742019ead5d0dfd8f5e68344fc214a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites and other disposable hosting domains, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://bidmitt.com/img/files/file/48609128389.pdf
    • http://irina-beha.com/ckfinder/userfiles/files/rubozunosubefagowirufazu.pdf
    • http://tanriovermensucat.com/uploads/genel/files/72524608569.pdf
    • http://laarakkers.com/ckfinder/userfiles/files/taxalisuliwijipop.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114755bdba50---62480120821.pdf
    • http://ysmenmidwestindia.org/uploads/userfiles/file/file/makapegedato.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547d351aa4---legijexulopenorade.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef7637b0c0---39792479451.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/cf121289239815d4b76f920e352f8fb3/somovevo.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161007a4d36ca2---wanefarepusilo.pdf
    • http://ambvetesopo.eu/userfiles/files/23701762662.pdf
    • https://zoorichi.com/temp/fckeditor/file/20282329906.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098960e82922---tevon.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/pu2djd727ophstfh3dta7frko4/69280826343.pdf
    • https://olympicwroclaw.pl/zdjecia/fck/file/danusalagesupeseteve.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c8609f7b---49675257938.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b033c043a6d---11849473204.pdf
    • http://atol-res.pl/uploads/file/90422494393.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/8889975637.pdf
    • http://oryginalnedekoracje.pl/userfiles/file/reratimofufidosuxejaroxup.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca331787b7---zizul.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/4e896bcab542a65643b328a0a06089a6/pajelukurarejapik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=jang+ohad+in+urdu+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_off0000d43a.bin
517d620c6e860b587b8dd9bc3efd5c7ac22a3a2a3809a1ff8b722321ace88a8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD43A 10424 bytes
font_01_sfnt_off0000eb78.bin
ea0f1c32aa6077d908683d440940700d6c1784e918f1b08b0b8557109f0837cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 20596 bytes
font_02_sfnt_off0001212c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1212C 16792 bytes