Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb99342e6b1a1863…

MALICIOUS

PDF

41.5 KB Created: 2021-09-07 01:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3b962f0aca6ec342b187427f30e01cd4 SHA-1: 6285225cb1840065da3588a63d956556a40c3411 SHA-256: cb99342e6b1a186337deefb28e789ba17f47f0596cee3ebcc50a9fb9033171ae
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF is identified as an image-based lure, typical of phishing campaigns, by multiple heuristics. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7916

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 41 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://macautemple.com/userfiles/file/subowemofo.pdf In PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/a013ddn9kljd9040g3d9t8jesm/zuribalalumikem.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/weraxafubesipededuwakem.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce64edf1bdf---diberomogifoxinal.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115fc391ec65---tewugexixefezijev.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/31021337679.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/039f0754e64e1ae2e0672d1c262ce8a6/pixobeburig.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/67258150013.pdfIn PDF document text
    • http://erdbau-rauch.at/famonezubegarafidinuwux.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115fc85a0d0f---93672364549.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/lorakavivorebuna.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/43263789114.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/49887430413.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075445b92f32---fupod.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607233a6df5eb---8147862411.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/wegifevolab.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3142048---65627567331.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160850c2de7d61---68133092015.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e8810968---zutagurawewopur.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f16c74b5927---67611774445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=total+body+dumbbell+fix+workout+pdfPDF link annotation

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