Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c40f5dce601152…

MALICIOUS

PDF

303.6 KB Created: 2021-06-14 00:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0fbd7eeff748fe0785f9001d1e0738d9 SHA-1: b4f440df9965db94122048a95b00ea1f5ba74a9d SHA-256: 88c40f5dce601152efcdd8229787a5cb23d4e2a362720a4dfb0bdfa8a41ee9c2
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains a URL that appears to be a lure for watching a movie, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=watch+gurren+lagann+movie PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a0ab43854---vukomaxurifajubekubo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4f221f2ed---22111213600.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/928d416bba33f119d7c312add32ce676/xujadow.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/32270189459.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894ba7c58ed---63980522498.pdfIn PDF document text
    • http://edgecs.net/documents/70701833902.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/f0ba340b04b1ef21aaba2dd060f02bab/gazenerivafotat.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3065fc388b---binugazoposo.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/papirudenekidegovumuvod.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/bosasisobaz.pdfIn PDF document text
    • http://gphs84.com/clients/866382/File/64235063418.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160788b4ac3580---99404293454.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160bb107ad7922---84195445239.pdfIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000288cd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x288CD 202410 bytes
SHA-256: 3e3f6e345be4b7d0b6c806cfc8c1451f476214cd4f5b5b0e7189e57b58384505

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