Malicious PDF — malware analysis report

Static analysis result for SHA-256 896607b51b41ea66…

MALICIOUS

PDF

80.2 KB Created: 2021-06-25 21:23:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 392a534134cfa4eb51184562dd5fec29 SHA-1: 61da57d57a4fcc3b52f33e2f943a8f943482b3b8 SHA-256: 896607b51b41ea66022ca1d15a794ebe2e4de4e34f09af0e2d6d19b78ac62a5b
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 designed to redirect users to malicious content. Heuristics indicate a phishing and potential trojan distribution, with ClamAV confirming it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=phrasal+verb+for+look+after
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7898a36c---buvozire.pdf
    • http://nadiadsa.org/userfiles/file/fapitejogukaget.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d036e9a16ca---34936451380.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/514a7d36c6f2e333367d844ce4f454dd/23238081424.pdf
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/4338a57ccab9791811bc0f4caa254bd5/5369656470.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/uddhkeofa3e9jrkhikscdmm7c3/28304684255.pdf
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/3ab0d88336de5a66a02445cc002781bd/10970808057.pdf
    • http://jrpst.pl/userfiles/file/13982726001.pdf
    • http://petukmahaaaraj.com/userfiles/file/fawavitefiz.pdf
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/19037dc86107deef8dbb9f29f6be80ce/lunobodegavubolegun.pdf
    • http://afghansolar.com/userfiles/file/jomizovavoxoribidulagiro.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7hgfl242lf1merf9ugu06o8kd6/10397177667.pdf
    • http://randalljroutson.com/clients/44711/File/zosaroturo.pdf
    • http://vinmexindia.com/uploads/zuvif.pdf
    • http://apsara.ru/userfiles/file/nifuwetifukaxemipepon.pdf
    • http://hncastlecable.com/d/files/fozopunuxe.pdf
    • http://schooldistrictservices.com/clients/f/f6/f6ab1571d2cdf5e569af7b76e288b17c/File/94642094928.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b738989a3bd0305768dadcb303b7517a/lirufana.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/p7srhhe3vedoojth83001bmje4/21533778540.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16082547280f46---nomiwufepu.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g7gc4pir3n5f90bkaon205aph0/70221954350.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef86cdf200---41816095776.pdf
    • https://synersys.fr/contenu/file/91605680013.pdf
    • http://bularz-auto.pl/images/userfiles/file/tokanadefefagebofa.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_off0000d733.bin
0e59d42afd97ee446e923d23ff84fa69a6930b9031d9a9e127655f4238ceeecf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD733 17204 bytes
font_01_sfnt_off000103f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 16792 bytes
font_02_sfnt_off00011c07.bin
25164e66df2af968192c7e8be8ec3186be6b8a32a320762352ff7a845eb70b1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C07 10412 bytes