Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc3ca0b765898e7…

MALICIOUS

PDF

80.3 KB Created: 2021-08-19 06:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef0495e8cdb386b2f3626a914e1e6fa0 SHA-1: fdaea1795896d7277c68b1da00c11f51f97a1d36 SHA-256: dfc3ca0b765898e78438aab6fd9d8e0b302b4e030cbafe42633e4dedd3bb74a3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised websites, suggesting an attempt to redirect users to phishing or malware download sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5b4r4h4sntko6cq4jevouhc9v5/zuxemujejovu.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5e44feb737---kozuwakotaj.pdf
    • https://landbar.com/app/webroot/js/ckfinder/core/connector/upload/files/14418044654.pdf
    • https://dbmotorbrokers.com/userfiles/file/sizojakebopegawomizaxem.pdf
    • http://babamoleskine.com/files/file/21373925554.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/fj8fdonsho288313v2075n9din/2089963531.pdf
    • http://elijasprojekts.lvfiles/file/82122422399.pdf
    • https://bucatariizidite.ro/printuri-fi/files/bifulejuvidususe.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607035d38cd02---vadebomago.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607460b271dde---fututojadi.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/pejenukixuzalafale.pdf
    • https://geneolock.com/ckfinder/userfiles/files/15356559177.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/e95ace24ffb0cf491aa73048cdee3f0d/zuwekegofi.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/1762f822ef14c508f486fc7b688f1188/85619776026.pdf
    • http://foxhill101.com/userimages/57179102203.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/a9143079ae133df674dc8dd3f810b6da/42110691793.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/l04boobjjee1qacpk47es5jm9c/kavemamoxagufezu.pdf
    • http://designklasse.de/ckfinder/userfiles/files/meluti.pdf
    • https://lotte-ppta.com/beta/assets/file/xivemokujudedekov.pdf
    • https://nestaerospace.com/uploads/file/nadumemabuwuleb.pdf
    • http://cristal-in.fr/userfiles/file/66366028584.pdf
    • https://psihodesk.ro/ckfinder/userfiles/files/vudaxepofasirowowuj.pdf
    • http://abpaluso.com/upload/file/gemujewoxur.pdf
    • https://advik.net/userfiles/file/savazokafokubigemilege.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=oil+capacity+of+briggs+and+stratton+190cc
    • 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_off0000d3bb.bin
e5cdfc93ef9c98cbf8dc225341e67b576cedd9b9755abc92f1828e847c0556d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BB 17140 bytes
font_01_sfnt_off000100b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
font_02_sfnt_off000118cf.bin
a0e39b798b99a3124fe06ee251de8e53eed16335dd573705c975bcd22d85fb26
pdf-font-stream PDF embedded font (sfnt) at offset 0x118CF 11284 bytes