Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca51fb364215427…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 09:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a9f49ca8ca7572d8fd02804fd9dee33 SHA-1: 6aba7f1efbe08fa59929dc87d2504c219f118d72 SHA-256: 9ca51fb3642154270f3643697b15fb9368f83bbbb69bfe2fa4c5fe37b9309694
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cathugo.de/res/wysiwyg/file/bunurez.pdf
    • http://travelbilet.ru/sites/default/files/file/sanotodeluf.pdf
    • https://bio86.net/fichiers/93380069693.pdf
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/6d6c01b4c3c9d57a1a00b24fc68c8cfc/68762594234.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/47105612947.pdf
    • https://krygina40.ru/UserFiles/File/72607480783.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/64194356444.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/62382489260.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9ul3773le6ed9smooklj8sqmbk/wowatuwiwapi.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/2353a3128a8f55a643640e96b38d2f68/25730511338.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b9ab9ce9---kajobeli.pdf
    • https://studioconcept-stand.com/fck_userfiles/file/76986831634.pdf
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/r3qdqj8hd5a79lhrsgm17eu4ve/nukelabewugikojes.pdf
    • http://ahkjt.com/upfile/file/92747279075.pdf
    • http://cbwmd.com/uploads/Files/jusigudikuvamuval.pdf
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/0e548nbsst2hhnv657kc4d7gb4/38096114370.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/paniloruwalevuvo.pdf
    • http://gzhangqin.com/uploadfile/files/wemasitutuwizitipawuxiwa.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/96e1ff71592bfe19d61277a9efbedc3b/bemodivo.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f9b873242---10297880415.pdf
    • http://reckdance.pl/userfiles/file/25595780674.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/8e4bee129fb1e57f8f60fa01a5bf69e8/10781375568.pdf
    • https://alternativecarrepair.com/userfiles/file/60067763020.pdf
    • http://vrakskodamnetice.cz/file/65781953563.pdf
    • https://aviatroglo.fr/IMG/file/80351277442.pdf
    • http://geose.ru/userfiles/file/nefilupe.pdf
    • http://saveursetsavoirs.fr/image/file/rosofarupa.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4fa64d54---rotepoxosokilo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=200+sit+up+challenge+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_off0000d85d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 16792 bytes
font_01_sfnt_off0000f06f.bin
b01aa13ce183c0e73bd04890026b7ba651e57c9726d80ba815603794b0965705
pdf-font-stream PDF embedded font (sfnt) at offset 0xF06F 17648 bytes
font_02_sfnt_off00011e66.bin
4e2e2ecff81f4060086aa80abd765a6709f44caf3b56385dcc0790e0420a59a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E66 10924 bytes