Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3bc5befa9dc65e2…

MALICIOUS

PDF

41.5 KB Created: 2021-09-15 12:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e3c1950b4023ed04c9f97bb59f685d36 SHA-1: 1d295a14c2f26657d926e59493df14b3531f2ac5 SHA-256: f3bc5befa9dc65e26d7006ef82e31827afc851eba22843f2d360eef7c08ec32c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing campaigns, designed to trick users into interacting with hidden links. Multiple heuristics indicate the document is a link farm pointing to potentially compromised websites, 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 0.7987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://avvocato-callegaro.it/public/file/97391782283.pdf In PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/12683813525.pdfIn PDF document text
    • https://trexanh.net/upload/files/95360140924.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/f2e02f1272b2953cff02b1e409c30f1a/26125288362.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/flq688pralpsc248va22tnc5m2/55659749350.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/1487416510.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/92769856488.pdfIn PDF document text
    • http://cluboutletmoto.net/campannas/file/57413302343.pdfIn PDF document text
    • http://rurisnet.org/images/file/32922827365.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/47961064146.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/9b6974c57c2e87abc31eb63e04cc8611/tegugax.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/89362465692.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/merolusorofamu.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/mukogonelak.pdfIn PDF document text
    • http://professional-tuner.at/uploaded/file/buvomimaxanojebawidivum.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109130016575814.pdfIn PDF document text
    • https://kimcert.net/E/file/teravawobobumimiraj.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/6410964229.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/37829086478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=grabar+audio+con+pantalla+apagada+androidPDF link annotation

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