Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f46e2e7ab5f0ce…

MALICIOUS

PDF

41.8 KB Created: 2021-09-12 04:08:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 90c6f6f27c93346419f3b07d7b0596fb SHA-1: a00145120374176d9f22f1e0810a1cba30a87ec2 SHA-256: 04f46e2e7ab5f0ce3cbee5a077a531e8674c88a8e9a7b4bd4ca8bae32ee34095
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, typical of a screenshot designed to hide clickable links. The document body is heavily obfuscated, but the presence of numerous external URIs, many pointing to compromised WordPress sites and disposable hosting, strongly suggests a link farm intended to redirect users to malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7092

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 https://krisoc.ru/uplcv?utm_term=utorrent+games+for+android PDF link annotation
    • https://eobliecky.sk/userfiles/file/6761983616.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/53090686900.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090512471670554.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/labepogofeneriwikuvopobob.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/naruzugudaj.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezurevog.pdfIn PDF document text
    • http://antonellascarpittadesigner.it/userfiles/files/54189525928.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d24e36114c---fowozu.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/51136663245.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/46207982467.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cbf26ff0---zufibuvoluw.pdfIn PDF document text
    • http://etre-belle.su/images/file/75799959451.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/48664227523.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/79642419058.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/p14fgobp69u0s3adok226n05v0/19352579937.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/34290053384.pdfIn PDF document text
    • https://gplacestracker.com/userfiles/file/80385773497.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/worolibusupomejuboramize.pdfIn PDF document text
    • http://budka39.ru/files/62679839906.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/xiwifovag.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109030401244406.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gumupolepubipobizosibosow.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/16496407828.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/bc1a2eb28f9c75ddd81115302b1dd4cb/2468268065.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/83150835015.pdfIn PDF document text

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