Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf8fd2265b789441…

MALICIOUS

PDF

39.4 KB Created: 2021-06-10 12:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: e3cd5e10f893f9909b9bafaff5a45a29 SHA-1: 2c5d040e490c3dbb3c64f56efd3bdabfd696708e SHA-256: bf8fd2265b789441e4831cfa344848873a286b339a47bf2cf9a53fb282d549cf
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and an ML classifier. It functions as a screenshot lure, presenting a seemingly innocuous image to entice users to click on embedded links. These links, such as 'https://huntic.ru/uplcv?utm_term=converting+fractions+to+decimals+worksheet+6th+grade+with+answers', are part of a link farm hosted on compromised CMS uploads, likely directing users to phishing pages or malware. The document's structure and embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7786

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://huntic.ru/uplcv?utm_term=converting+fractions+to+decimals+worksheet+6th+grade+with+answers PDF link annotation
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608067a39efcd---43807581666.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160731ee0873be---kasetoj.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608155f6b022e---64548013935.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/ahjb1qe4tkp56u57tmnheha9p0/45354842491.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/noxud.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/ninife.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/87512156121.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ca05144f---dalavakedada.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/cc111dc8ae6d2dd3aed5c017dc9bf65b/suvaliwinotanulakoter.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077b99d96914---riwukakinoro.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/29966254673.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/guxanizazup.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ma04n05co0jjbldgjjekcqcsfs/29914373192.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/nelidedid.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/f1omovqim8qpu6e4h7rpitik56/fusixoxalalotisuzulaxame.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/93169028258.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-contentIn PDF document text

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