Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45526fa5736c677…

MALICIOUS

PDF

39.4 KB Created: 2021-07-03 00:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 961467aab0dbd1543af548e58ff44aa7 SHA-1: 62f6bfc736cdde2b0d9f0cf14ca061a29792e72d SHA-256: f45526fa5736c6770cbd13f51977d5f084e1421460f67ef92479ceb78907baf4
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8579

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://chcial.ru/uplcv?utm_term=attack+of+the+bayport+beast PDF link annotation
    • http://jyjwqj.com/uploadfile/file///2021052313082128.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210607064716.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081cfe6ceb26---35430631259.pdfIn PDF document text
    • https://chungcungoaigiao.net/uploads/files/71680207844.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/zoresawutusosatukijajub.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/damenadiwikuwa.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/sanawefuwiwimuxuxe.pdfIn PDF document text
    • http://yuha.be/_files/file/xugefebizajafumugule.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/3155c232988692fbc969daecfd9ebc38/69951956345.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/midolupan.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab786cf56---87090359652.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/2e66749442ae7ed5a9bbcc4e9e1941e8/guregunenobikubukatelot.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050311005537.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609af6bfd586b---fepevimazopapus.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c656f7e0a4---taxosumodigi.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/nuwoginorenobijuj.pdfIn PDF document text

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