Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff644feb3298ef9…

MALICIOUS

PDF

88.6 KB Created: 2021-08-12 07:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b65ac7e2380d88050552948dda8e56ac SHA-1: abc708e46bb4d409695d083c9c8c9705ea778568 SHA-256: 7ff644feb3298ef9393cbe93e7b813401aff0003508bd6581a5148abc402b605
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a2c6e84c618d45e3c4780c28c58a7ee2/26401261967.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607063d1aed9c---gewutotale.pdf
    • http://stellar-toys.com/ckfinder/userfiles/files/fosolelexetujuned.pdf
    • http://asesorgubernamental.com/images/file/xubogimejolasoxeporavixu.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/3804658035.pdf
    • https://karapinler.com/calisma2/files/uploads/52476731748.pdf
    • http://novussiteyonetimi.com/uploads/file/23574577222.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/11efb076580d327a6dfbcc1162783eba/34639113780.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/57621818f9973c9a83c858c26521537f/faserabewe.pdf
    • http://belv.ru/userfiles/file/rubofowuduna.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/26337fadd329d656513488d374c1a277/bezuvebepujetikozifebov.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/phrf3jtkao2dab7niij8o3624a/piforab.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/55kg6689ct2rbb9qmtt0gtq7oc/dijesidevesudusevoditel.pdf
    • http://montaze.org/democms/userfiles/file/loxuluxetumadoge.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a269b582fcc---xosazi.pdf
    • https://termofriz.rs//files/sojikefanarabikuf.pdf
    • https://leresto-niort.fr/images/userfiles/files/rolevotarefofesipive.pdf
    • https://dacola.com/upload/files/mevaxefuzujor.pdf
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/gamojuvama.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b3c54b8ae---23050689589.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e2f025d1f67---43901560228.pdf
    • http://gianphoiduyloimodel.com/Images_upload/files/zetejupexevob.pdf
    • http://phuvuongcorp.com/luutru/files/16504280305.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c2afdc69626---14449549916.pdf
    • http://kidsjeodo.com/images/files/dibabozegewexoporug.pdf
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d075d0091---7683632743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+4+steps+of+lectio+divina
    • 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_off0000f7ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AE 16792 bytes
font_01_sfnt_off00010fc5.bin
4efc2268670d0eceabf0ed9e185880a60c7a6b23db7527835181c4df09151559
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC5 10852 bytes
font_02_sfnt_off000128d7.bin
1e6aa73b67f8fa5b45224f9a680d9f57b0230a772432e3ff4634b8828e1a330f
pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 17060 bytes