Malicious PDF — malware analysis report

Static analysis result for SHA-256 5513035d0a397feb…

MALICIOUS

PDF

69.9 KB Created: 2021-09-02 03:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 06d21087f5733e903afcddeda503d21e SHA-1: e10bc1917c9ee687928a72d85ff3e4b7cc4eb0a6 SHA-256: 5513035d0a397feb7245e0d586baf9339c1305572842746ff2af147915e51dc7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8061

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b66aedd7248---39945101752.pdf
    • http://honyi.tw/ckfinder/userfiles/file/73125250383.pdf
    • http://klawiatury-foliowe.pl/_data/file/fugiwojik.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/250fc713cf40edbb2fbc0ee18ae5c968/pabegogonumabewomeme.pdf
    • https://shibbirs.com/media/files/95514922175.pdf
    • http://branonperformance.com/ckfinder/userfiles/files/xonuralikezixudafeze.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/53398166148.pdf
    • http://aps-mes.com/files/file/45875271606.pdf
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/famiza.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/41684863430.pdf
    • http://s-pack.kr/userfiles/file/20210901142143.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/razujufofelenogefono.pdf
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d1223ea43ad6a1d4b8e8a241f0065f79/kovonitojutawemi.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/54n76bucfnnrnlprotiss3aai1/11188493576.pdf
    • http://billsky.ee/files/file/tujesasoluradatope.pdf
    • http://clubmaniacr.com/campannas/file/livizupefonupagakeda.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/o45u0rubimdfijcvch2qs087l7/nogal.pdf
    • http://modnyi-buket.ru/uploads/files/1351549906.pdf
    • https://fizjolech.pl/userfiles/file/buboxujokivelelukab.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/sejinopa.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hopelessly+in+love+meaning
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea31.bin
08aca7b3fa6e0a180f1e740a287f65de6b968b6b86ba59da48d21f46c5477e07		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 10568 bytes

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