Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b40a4d59bda461…

MALICIOUS

PDF

40.7 KB Created: 2021-07-15 19:51:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0f6e9474fd876aa04d613d270825a75c SHA-1: 01ddca56d124af20e537ee36e004687035ba6941 SHA-256: 66b40a4d59bda461acd21cfbfe654d66945af8c3adbe9a355314a1871a0aa396
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF is identified as a phishing lure due to its small size, image-heavy content, and embedded links pointing to potentially compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely serves to redirect users to malicious sites or download further malware, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9382

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 40 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://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/0amgjjg89bdv7b5kecg472d6e7/59433224263.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/55038126313.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/49395782672.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/rugixenufifoxatib.pdfIn PDF document text
    • https://davaocarrental.com/images/file/38849067641.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/gevusu.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d56c947f0---48981770806.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/puvalutezalawinus.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609351711e2b2---87253069440.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bff559c4fc8---taxejugufedunepavejez.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c147f3c9b19---78236235145.pdfIn PDF document text
    • https://agatanorek.com/files/file/46052269873.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073174381995---kexabilupabuzilo.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a177f8c576---lijibalamabogupakosa.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/75507044351.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/42607611770.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/71982276333.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd69c5a533---sivipovezebixeperakudezod.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/94146268835.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/7c1738fc7e31e41a4e933c24b5f5ecb1/ponolakilomepume.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/pluginIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=literary+periods+and+movements+timelinePDF link annotation

Related samples 8

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