Malicious PDF — malware analysis report

Static analysis result for SHA-256 94424876e84aa001…

MALICIOUS

PDF

85.8 KB Created: 2021-09-13 09:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996de6763ac88311bb21d6d705da8654 SHA-1: 897a68567aaa1a3dd946f1428ae88090f9eed8ad SHA-256: 94424876e84aa001cc0a050d7bb649f2d685ca82f22b1036cb23db44da16f10c
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 potentially compromised websites or disposable hosting, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://qazaqbanki.kz/data/content/files/74085426395.pdf
    • http://keifo.ru/ckfinder/userfiles/files/pokexu.pdf
    • http://vipnovini.bg/root/f/uploads/files/65155634931.pdf
    • https://cribpointonline.org/cribpointonline/userimages/file/89186732070.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/56013095918.pdf
    • http://owv-sad.de/userfiles/files/wanudajinidofif.pdf
    • http://lamelove-zakryti.cz/userfiles/file/97826228131.pdf
    • http://www.fashiongale.ro/userfiles/files/97334837965.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7b925d825---gidipazipezogoz.pdf
    • http://monteconsultants.com/image/upload/File/zezewabuvijagarabovu.pdf
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/zifububupusurod.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392f0aa1586---namubodotuvenekiruxom.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/86476056173.pdf
    • https://eastmanllc.net/ckfinder/userfiles/files/jazegareju.pdf
    • http://ptsound.com/plugins/ckfinder/userfiles/files/tijewod.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a4e6c279684e47ced76e09fc8e3ffc91/17113971622.pdf
    • http://pytextiles.com/userfiles/file/22683031859.pdf
    • http://lezeckastenakosice.sk/upload/files/46891843875.pdf
    • https://dptech.vn/uploads/files/37760704906.pdf
    • http://exdebt.bg/userfiles/file/53734242181.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/rubuti.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=deadpool+vostfr+streaming
    • 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_off0000e0bf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BF 16792 bytes
font_01_sfnt_off0000f8d6.bin
746622e812f4f9af2b7eed42fa05270cb707dc49a328e66acfe8068b5007888c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D6 10908 bytes
font_02_sfnt_off000111dc.bin
1c0150d0c4b51f689d8db81344eb4b6d0563fbc886fba676c45d9309a76a90e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111DC 21500 bytes

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