Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cd0c9c7ea7117c9…

MALICIOUS

PDF

76.0 KB Created: 2021-08-30 20:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82fc3db2c31e1c4f758c2908509f3e28 SHA-1: 155d44b2f8b1c74016af1c2eb54a21558ea56761 SHA-256: 4cd0c9c7ea7117c9c77c9a1a4c760e0aea1b3cd8edf4e9da773b9aad5ddaf332
96 Risk Score

Malware Insights

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

The PDF file was flagged by an ML classifier as malicious. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to potentially compromised CMS upload directories and disposable hosting. These links are likely intended to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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://henrysadiereunions.com/clients/876463/File/tuwofewikediwawigudegax.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/via5s7fghk1909vr34rcq3r613/86023677776.pdf
    • http://phonphangschool.com/upload/files/siverawonavizofuwawut.pdf
    • https://deltaguvenlik.net/userfiles/file/wopotonugemikop.pdf
    • http://av-jet.ru/userfiles/file/74686010225.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d859b3b576e---70571559478.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/tovidijoru.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/jorozikinavezexugul.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/99njgibqmpusubkmm58j1dvut2/91441371257.pdf
    • https://ludifrance.fr/userfiles/file/sokirojokopizupope.pdf
    • http://gongotour.com/FileData/ckfinder/files/20210611_063A67ED9893331F.pdf
    • http://locum-system.pl/userfiles/file/zufoxazoneduriperisoveg.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7e4a17bae---78856132801.pdf
    • https://manenshop.com/upload/files/sobuvatulufanemugususobu.pdf
    • https://aradovan.com/userfiles/file/231302424.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f772b7e54c1---tesulixejive.pdf
    • http://dichvuhieuchuan.com/upload/files/giketozelufi.pdf
    • http://uhy-th.com/image/upload/files/98309425410.pdf
    • https://mariellatriolo.it/public/file/52362479436.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=kashering+glass+stove+top+for+pesach
    • 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_off0000c57a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57A 16792 bytes
font_01_sfnt_off0000dd8c.bin
cb626ab7717ac1a9a6294f9c0137ca25ebdb703b4d3ae7f7ce214c0e5566ca85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8C 16636 bytes
font_02_sfnt_off0001086c.bin
dc75ac2c5edecb7a5183effb8cfeed4e5844fb8a855371180c3223c6211398b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1086C 10816 bytes

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