Malicious PDF — malware analysis report

Static analysis result for SHA-256 33808e0f1fabab12…

MALICIOUS

PDF

41.5 KB Created: 2021-09-29 03:30:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3558ac431b52d7e0d3973da7ee66c07e SHA-1: b505642bdf839d0115f9e724b37b5a48652d900a SHA-256: 33808e0f1fabab12b3ee809ef0fb795ca0b61b7384c3f51b3d8ba402696dd94b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-based overlay and numerous external links, including one pointing to 'https://smidgel.ru/uplcv?utm_term=free+streaming+movies+android+app', suggesting an attempt to redirect users to malicious content or phishing sites. The presence of multiple links on compromised CMS upload storage further indicates a coordinated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8814

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://smidgel.ru/uplcv?utm_term=free+streaming+movies+android+app PDF link annotation
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/h9difh4btjp23n9c5204bnufvd/92448296157.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/didikikekoluxode.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22525826925.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614112e5e9b2c---17108499939.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614464c85b2a7---gokojamizakajubin.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/fovixavogesi.pdfIn PDF document text
    • http://photo-poligrafic.ru/ckfinder/userfiles/files/kakupinugag.pdfIn PDF document text
    • http://artio.pl/files/files/90893131419.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454ae324b7f---84252142239.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/63873357806.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/93358195869.pdfIn PDF document text
    • http://klsele.com/userfiles/file/1632785755.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9592ca65c---86490150097.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/58684067212.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/22794771091.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/92845217160.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/fifulekuzofujewax.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/26631348510.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/pululomodaponuwawu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/256185892.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/33459045425.pdfIn PDF document text

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