Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fc881cafa4d4f12…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 13:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0a2f6d3fa738c60fc995dff674223505 SHA-1: eb377a3cbd81d00fe0897dc89fa357b5f5265e74 SHA-256: 0fc881cafa4d4f1213c90a24da12cf9d4abaf2edb8967626b01e460845b75f0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit user trust via deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4708ce9c3d56144762b3320932829df8/terawoxefixugukodeduf.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c00241431f---50342009747.pdf
    • http://samnakthodrahassob.com/userfiles/file/73204334334.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985a62ecc21---juvikaxitodinozofup.pdf
    • http://driver-jazda.pl/upload/file/duwajowekunitixu.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/68d8ab6280cc08d6f786f3b5c7a770d7/rokizevukixoj.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c925b5bc7---22259829.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aceafd25366---22250006113.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086787f02805---70219061038.pdf
    • http://sl-light.ru/design/img/upload/file/94127571861.pdf
    • http://maasmartcity.com/userfiles/file/pepegimajemoguvorunasoli.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b86cc53de---17121410389.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6500c62bfd---5354465629.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a2fca2ef5a14f9f713111aba523c7074/89056683932.pdf
    • http://iphysiology.ru/upload/roriz.pdf
    • http://absolutelyneon.com/userfiles/file/80220734532.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+send+pdf+to+laptop
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcc3.bin
fdaeb978aef4fc8ff26ec7ca89ea50eeabb1ec7827b54dcd18c65afb30dfdb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 10376 bytes
font_01_sfnt_off00011464.bin
8c56e103ea71cbe2f03cfec4aadf688acc32a6c579b58895aa8bab521404946b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11464 17256 bytes
font_02_sfnt_off0001418c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1418C 16792 bytes

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