Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ddaa64e688e190…

MALICIOUS

PDF

83.5 KB Created: 2021-09-24 03:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d2a4dc3883384d66d6f98bccb48bc3c SHA-1: 616abcce3d15cdf78a5c68938773f1c311944d64 SHA-256: c1ddaa64e688e1907e9dfe1d34ac4b84e4d990324b39d03b8e0e842c7dfb9579
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 disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://kossuthdigisuli.hu/userfiles/file/vibabibexe.pdf
    • http://cungcapluonech.com/upload/files/66320988565.pdf
    • http://yachts-trade.com/files/24238541902.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf456f5b6---77845850164.pdf
    • https://nusamulticentralestari.com/Uploads/userfiles/files/42888927731.pdf
    • http://riph.pl/userfiles/file/56912976979.pdf
    • https://borgopitti.it/userfiles/file/rigisitilubixijiliravoka.pdf
    • http://fundacjahfg.pl/upload/file/3713069163.pdf
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/23420415711.pdf
    • http://indianspringhomes.com/userfiles/files/kodolerema.pdf
    • http://foodchemsino.com/d/files/51186059668.pdf
    • http://xahscw.com/userfiles/file/53648008109.pdf
    • http://i-dron.cz/data/file/47661664966.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd288559c2---89604357256.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ef12f3b47---27536201730.pdf
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1614b1c9406aae---17872792177.pdf
    • http://texinpack.com/uploadfile/file///2021090206483198.pdf
    • http://lunaleo.pl/userfiles/file/jabejuduvoju.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/acf0b60558f6d03705f323674b039289/tajijoxejodebarino.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1nmlcdujcii5q6gr268kitr2s3/jibujixowuder.pdf
    • http://nemochem.cn/upload/files/49288538461.pdf
    • http://rinsacars.com/files/others/76143544927.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+type+of+soccer+player+are+you
    • 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_off0000dea7.bin
2092b11156ecbe8e87c7eecdef30d4bf70d4eb6e93c8cc8bce48f0b13746c195		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA7 19072 bytes
font_01_sfnt_off00010fb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
font_02_sfnt_off000127cc.bin
8190b18c4e33965977344fe4f846acc96daeb3d379f65464e0c489d60ebe07d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127CC 10588 bytes

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