Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa949f192d2d1e7…

MALICIOUS

PDF

38.8 KB Created: 2021-08-29 04:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cab39ae343143d2f0795c25852f25e3f SHA-1: 41b2d7581452563ab805d08d37c6f15e364bb95e SHA-256: 4aa949f192d2d1e75ec2ccf9d015a351d38b75e15bbfa7f455a8dd1d6b728d7b
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 0.8588

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 38 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://mk-sito.it/uploads/file/35296686310.pdf In PDF document text
    • http://romengo.com/ckfinder/userfiles/files/tiridilagonuw.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/barodutajalojan.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce7ef4e6c8---nabumujenifojosa.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/4fd16f6546416aed684ecbacc4c68772/wajomosefaje.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b4920a18---gapofurudif.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/22477856690.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608212bd93ffd---1452133634.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/bitudozo.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/65890136352.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab30d5d7dde---nobuzujamimilawadusolu.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/kamolujoditu.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/tagijapaludenagodasomere.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c6e85559e41---voxalu.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/45119251810.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=keeping+up+with+the+kardashians+season+10+watch+onlinePDF link annotation

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