Malicious PDF — malware analysis report

Static analysis result for SHA-256 131ba893a873e1e8…

MALICIOUS

PDF

68.1 KB Created: 2021-05-25 12:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa70ac99f587aa85fa5d96132adb7ea SHA-1: ad8c39ad3e193f0765d76c66d44f499f04bda91a SHA-256: 131ba893a873e1e841b87df17a1dcb6a8319a86756eb62c22bbffdd0e5c8d812
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document's structure suggests it's a link farm designed to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8311

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=islamic+books+in+urdu+free+download+pdf+deoband
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hkq5rbns69iocil1tvc11lkh9q/vuruvuzukuxafiroga.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/40d7fe325414d86db3e2972302379e1c/fazujerajinikegofomagi.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fdf1ea901---jikiwubetikavo.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d72944fb---78764672035.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3ac4f228d---wogazo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/548524a24fb12b0dc025f9931051c68b/66058140750.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/kurazatujivot.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608df12feb5ff---roxigitaxabetaw.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160acbb2c3d56e---43585032668.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/104b05ef586db27554764f235cb26f13/3522856611.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a21bb22afb---livokezozilonoziwevagem.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/epg8f5lptkdtr678padre9t5i2/lagogedoxoxorirutawiz.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071161700210---pizalinererafumexivon.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01cf337c3de94b70c16c683bd51719bb/lawekomunutefe.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/5h1s9kmdihnutu28d34n5vafd4/80237393530.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/738a2755f451eb70be3422a6184ff4e8/duvimixiviwedesamarupemen.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e454.bin
535a8dd72860a7d84fd1ec1cb5f8f8a9df2709eab07b2d5228979dc9ad40b2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE454 5336 bytes

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