Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9fcba4aad77f6b…

MALICIOUS

PDF

69.4 KB Created: 2021-09-17 16:59:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f57ef1914841ef42cd66a25c87b5b63b SHA-1: 1910a5ef97f021ce32cbc2668e90dfffc6bfe1a4 SHA-256: 3e9fcba4aad77f6b885a5f6d0452f1410b31298141d90557c4bcb5eb7ee48874
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for SEO manipulation or to host phishing pages. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific user-facing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://animationcoach.com/userfiles/file/21895480102.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/161414afe5a7ed---zofedexofoxagenejovu.pdf
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/67968679763.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613123eedb176---66092917866.pdf
    • http://puntolinea.org/userfiles/files/betamumele.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/lf485bf3a7qjd7354els2la864/kazaladeregeritedonavadi.pdf
    • http://axiomestates.com/userfiles/file/18976282277.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/sepibipurelego.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403223a7af5---31305993814.pdf
    • http://atreve.eu/ubezpiecz/obrazy/file/kukavikoziruzireterema.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71dc6c1df734936c250f742aae378bc4/50119629428.pdf
    • http://grandinhr.eu/images/user/file/fomalanifutikiwaf.pdf
    • https://processwork.archerhuang.com/ConImg/files/rexarem.pdf
    • https://sambelteri.com/contents/files/xebavejupajojevufejozozul.pdf
    • http://riccaassociati.eu/userfiles/files/bujavugotezologilebifaxi.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/3fc9d7b9513e7ca20c31d7885a59d557/91468624413.pdf
    • https://rocksoliddesigns.biz/userfiles/file/67204984821.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/038faf57ba847461e0b8c3eea38fe983/67103152197.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/59bcdde3bab5e15845224dd35b8ee547/kixexabekizuvorajis.pdf
    • https://skvely-kup.cz/files/file/difugudinepulumariwax.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613781ad0368b---84388122594.pdf
    • https://robodom.si/files_vsebine/bapofof.pdf
    • http://gewald.ru/content/Files/57443574333.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=soccer+free+streaming+services
    • 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_off0000b179.bin
377420e03fe9636a74d605f00868740dfe5f6642f340ea3a01790fd5c1febd97
pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 10776 bytes
font_01_sfnt_off0000ca51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA51 16792 bytes
font_02_sfnt_off0000e263.bin
60a0e639ec4d36d7d70f31af86b916dfd53645ce91c28905c70ac923663956c3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE263 15096 bytes