Malicious PDF — malware analysis report

Static analysis result for SHA-256 237518d6a9a3689e…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 05:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ed9cbd244e82f3c1c278f29666720bd SHA-1: 5139f929bf7cd96050f9f34a132f4f7edf9d5739 SHA-256: 237518d6a9a3689e0c1adea8ae2fc251ff6d22f722af7983abed7d80a334247f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://dvif.fr/userfiles/file/31661902000.pdf
    • http://giovanniseneca.eu/userfiles/files/97815108935.pdf
    • http://broadgatecapital.com/userfiles/file/18142082588.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bda93bb657gqn8si204s2d34t8/pelew.pdf
    • http://doggystylzgrooming.com/admin/photos/file/8538539297.pdf
    • http://novena99.com/uploads/files/202109151607409275.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/xinotetep.pdf
    • http://www.cerathai.com/image/upload/File/57000831579.pdf
    • http://kdekdyjak.cz/data/92458152278.pdf
    • https://normec-cm.com/ckfinder/userfiles/files/87382145631.pdf
    • https://wineuniverse.us/userfiles/file/49557704415.pdf
    • https://pvcmikser.com/upload/files/notiz.pdf
    • http://trevorhannant.com/64155405043.pdf
    • https://clubsecurite.fr/webroot/upload/files/tirubosojelojoz.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/66901463672.pdf
    • http://mitroc.com/userfiles/file/26139976778.pdf
    • http://hzqljsj.com/images/upload/File/dikiremi.pdf
    • https://urology-andrology.com/userfiles/file/46299883084.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac46185594---80125688267.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/73157654442.pdf
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/fobuzomodatilamub.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/8df6a9a56e2ee811b569378317d0e228/salafared.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=drastic+emulator+android+download
    • 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_off0000bd2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 16792 bytes
font_01_sfnt_off0000d541.bin
c50df33538e374b2d6180b02320cff2410deedbf8cb309242c33b3b10e277fec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 16724 bytes
font_02_sfnt_off0001004c.bin
659941dd83faa30cd2e833ca39e50103b3c3c51d21a08e41f226cdaac3f493af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1004C 10716 bytes

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