Malicious PDF — malware analysis report

Static analysis result for SHA-256 c58dbf362557149a…

MALICIOUS

PDF

88.3 KB Created: 2021-09-23 04:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29afb1a4ca124bdb9f3bfca886afc7af SHA-1: 3c4fc36eb2cb8a46ed798a7997d0f8fb29973517 SHA-256: c58dbf362557149a56ccd2ad80378b215a743942fdf7f74fb64d7bf17e9da632
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicate a link farm designed to redirect users. The presence of a URL with a 'utm_term' parameter suggests a potential phishing or scam lure, possibly related to game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://infrive.ru/uplcv?utm_term=gta+san+andreas+android+hack
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/be33bbb4271455c366e2ed3ee9c229e2/85404063521.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec90761468---fidijonalez.pdf
    • http://podarox.ru/public/files/bexeg.pdf
    • http://jeanchapleau.com/userfiles/file/noragitoranevepexad.pdf
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/nevitewoxuzazobuwuliga.pdf
    • https://unitedfightalliance.com/ckfinder/userfiles/files/94185877132.pdf
    • http://sro52.ru/uploads/files/subemakidukixugipixuvefe.pdf
    • https://aiaciran.org/cache/fck_files/file/76887201029.pdf
    • http://vietcem.vn/public/default/ckeditor/files/86521885947.pdf
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/kuledikowuti.pdf
    • http://www.tiande-global.com/ckfinder/userfiles/files/37461601098.pdf
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/58086126524.pdf
    • http://jumpinfit.it/userfiles/files/gigozewowaxose.pdf
    • http://dailymaydemtien.com/userfiles/files/8995756619.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147c0203844d---seropesekixajabukitejesak.pdf
    • http://ranch.pl/files/file/gizaletogavo.pdf
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/supogifoma.pdf
    • https://www.igescanada.com/ckfinder/userfiles/files/noxodaziwirofuxufoso.pdf
    • https://eirai.org/editor/ckfinder/userfiles/files/78685443162.pdf
    • http://hpworld.hu/data/pic/Image/file/xarisawolusekawikexo.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/jemisu.pdf
    • http://zxpgw.com/userfiles/file/97163721607.pdf
    • http://thedewakohchang.com/image/upload/File/ujajagebojuve.pdf
    • 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_off0000f410.bin
215d4e7dcc370d1e3d96207400ca0c67828610069ea3763b5dd65039add7ffc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF410 18860 bytes
font_01_sfnt_off0001237a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 16792 bytes
font_02_sfnt_off00013b91.bin
1958a6bec2c71523fad4f65b6b8cb48e0ebb3e739e5a6a48425531dd4a8287ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B91 10552 bytes

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