Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb8c90c66448cd2…

MALICIOUS

PDF

39.9 KB Created: 2021-09-22 22:35:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1daba16b4e140b135308bf6bdc7c784 SHA-1: 8d41f43c5c05a73f22dd1c1090f05dca262b7619 SHA-256: bfb8c90c66448cd29aae75b865beac1824c9a461e548561d8b948ffedb6a76ae
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, many pointing to compromised CMS upload directories, suggesting an attempt to redirect users to malicious content or download further payloads. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, reinforcing its nature as a deceptive wrapper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9455

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 39 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 https://laborke.ru/uplcv?utm_term=apps+used+to+hide+apps PDF link annotation
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/0a22847f1edff8440b855cf85b946487/nuganipoteku.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/joraneliganugikigavato.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/27652588955.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/dotaronananozire.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/45693644113.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/1f87fmuonub17vctrll7k1c9cl/lipalivukivexupit.pdfIn PDF document text
    • http://tochalco.com/uploads/files/zutabuxuwewefabizago.pdfIn PDF document text
    • http://china-miyaco.com/img/file/20219912547.pdfIn PDF document text
    • http://sicilalluminio.it/userfiles/files/vufesalelil.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/62906651215.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/pisis.pdfIn PDF document text
    • http://gns3.swiz.eu/files/editor/welataxada.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/20228221744.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/54491144480.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210913204450.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16148b6354f35c---15979115482.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/buvutij.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/83980937510.pdfIn PDF document text
    • http://ty-int.com/files/files/gikawonakokumulozapade.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/logawore.pdfIn PDF document text

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