Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc721360d923e673…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 13:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba5ea1a5619c6dc79688574719d45312 SHA-1: 12963831c5a18132c15865f9e85b12960cecf561 SHA-256: dc721360d923e673619a7aac129f5d38cc910adf359defccda3a0a5951d763ae
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 CMS upload directories, suggesting an attempt to host malicious content or redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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://rogersdesignhouse.com/uploads/files/daribezurugul.pdf
    • http://clingac.es/d/files/lafitixilowutugijagujoba.pdf
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d57c6aae6---88119003318.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/pah0vpak25aaohnsuahsnuj3t9/zamemunufini.pdf
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8592e738aaedeecd2cdc9308d72438c1/laxixuvabibawafivavozi.pdf
    • http://reunionclass.com/clients/7469/File/73621049175.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/87ec03acdfd9ef411695168cf66cc124/bajut.pdf
    • http://techbis.pl/files/file/tebexajiluxoxevisevaj.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a99655b641fe70fa5262323c50c7306c/sapazezovojibavuraxoxop.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/737c4aa0f66d02750b106a3e22ac4a1d/metativul.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e465df35---kazopozod.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bacc9a60bd4---sovobusuwopunokebu.pdf
    • http://etcad.net/np/upfile/file/lugijoradede.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32041d9ad4---31390285498.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=us+history+citizenship+test+answers
    • 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_off0000ee3a.bin
427e35ea422e6a9bf4d8437a5ebf44dc64a25539c8ef007df77d423efbcbaa4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 17816 bytes
font_01_sfnt_off00011ce3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE3 16792 bytes
font_02_sfnt_off000134fa.bin
3d8b2543ae95f13422a00355745f7268fc2ce687381ab06a71a25393271cfe14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134FA 10692 bytes

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