Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f568da9b9bdbcb…

MALICIOUS

PDF

84.8 KB Created: 2021-07-16 19:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6d5299d19c2e06c99076e338a549337e SHA-1: 68ff12a6e1f0622f159076ff0bb1a88c1f39f27c SHA-256: 18f568da9b9bdbcb985ff080c95e48cd827b28554f53cbcdd5edbb41a4a6f3cd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits a vulnerability or contains malicious links. The heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The embedded URLs, such as http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/h3opmmuudfa1ogetcijqbknll1/19303826163.pdf, are likely used to redirect victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/h3opmmuudfa1ogetcijqbknll1/19303826163.pdf
    • https://thinkhigh-tech.com/d/files/fidasaz.pdf
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/2ab51da9ef9ce18158f6d2256f963f9c/9357966165.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d32c635a0---daxiloku.pdf
    • http://bitite.lv/media/txt/122/file/nokumadafagunojefobi.pdf
    • http://robwalker.net/fckupload/file/32001671937.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/470ba1e1542d87defb0e6c266e7cb8ce/94452709306.pdf
    • http://kino-cosmic.ru/sadm_files/80387222600.pdf
    • http://alexhoffordphotography.com/temp/files/file/nagavafekuwarula.pdf
    • http://alexlunacoach.com/img/editor/file/lanaralamarokilapadigi.pdf
    • http://goldenbaycruisesagent.com/userfiles/file/7159312816.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e11c65a6ec4---xofokuvireseb.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e7dcaaefe8d---37354322860.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a90ed558941---62702388076.pdf
    • https://108pizza.pl/uploads/userfiles/files/papiv.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160deba5f9b289---65460819814.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/16ae03f1d1d82849c737c5a4d6d70bf1/sikoxa.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1606eaf8dbefa3---97566110578.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b6481fa5d18---11755044995.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4aa43d57e3ee4a5baa9a7ad3381ae1ff/walaveribodovupabomito.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a958be12a0f---88503732154.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=same+to+you+spelling
    • 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_off0000e900.bin
44e3b7e8681a9aff3af7e132330d3ca9217f3020f664a1149557bc38d253b664
pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10784 bytes
font_01_sfnt_off000101d0.bin
fe97a80f1f7415c43d7b7503a9a36785930df387be2cc2abe7fe9d9fded635df
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D0 17096 bytes
font_02_sfnt_off00012e86.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E86 16792 bytes