Malicious PDF — malware analysis report

Static analysis result for SHA-256 50079357ad656a4e…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 22:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cfc41d533627cce34f412dee1be6bbfb SHA-1: dd58a143ae92350216cc83906ca582bc7d6b3bb5 SHA-256: 50079357ad656a4ece263d984bcae23402763ab744b7749534a6653696e80c1f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of numerous links on disposable or compromised hosting indicates a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741c31a5c49---6840046765.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4126c2bebf---36738987421.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/5587189215.pdf
    • http://firstcuwire.com/file_media/file_image/file/75786556063.pdf
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/a11af661cd90255d11b6c4d995c9405d/tadexatokinijemazomew.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/b9mpln3hvaei72u2rk48s7i03b/xixabadivarifebubo.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/db566c20c8e8c33f13a6c45366359b2f/zibazuvogitokadiwud.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/fba7qvg8e5ei0ionbot8iou4nd/kumekoxoxudewozigo.pdf
    • https://behagi.eus/files/galeria/files/13481092974.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/293fabb8b296c77e49099928d0d52ef4/70100105013.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df98c16478---satemaz.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/4e6f887727b2066e6b761ab7e2424189/82104869862.pdf
    • http://ahkkpcm.org/userfiles/bizoja.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611aaff222261---28687303289.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/b83980d8e3b5d921ff53146a5dca101a/xixavojugi.pdf
    • https://valerart.com/ckfinder/userfiles/files/wujodala.pdf
    • http://thaihotelsale.com/FileData/ckfinder/files/20210610_C9DAC91953B7BC91.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e755dd5b13---86313441447.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4e23a75847---pisedudirifim.pdf
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/29488674841.pdf
    • http://corporatiegids.nl/uploads/files/94331076083.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/b13643a0003e4097e657c09c11255f3b/katunajiwadefe.pdf
    • http://ideatity.com/ckfinder/userfiles/files/10642884965.pdf
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3296e72c97f7515023bfedd8587b6770/rezulibu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=maternal+and+child+health+care+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_off0000e482.bin
4b047cf00c578005ec64367c35fdfd32068c9d6c3706611bebcf53d50299a160
pdf-font-stream PDF embedded font (sfnt) at offset 0xE482 18064 bytes
font_01_sfnt_off00011311.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11311 16792 bytes
font_02_sfnt_off00012b28.bin
5960321cb5cfb58527a554945995b797db1da7790c9209239c4511defe6865f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B28 10420 bytes