Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4dece6b3a8ac7a…

MALICIOUS

PDF

92.3 KB Created: 2021-07-01 14:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1849fabe1f78c6b8bc3fc6e7b5e39c69 SHA-1: 1b883b149cb7433a9d433b9e53a3fe5f315db743 SHA-256: bc4dece6b3a8ac7ae6a4dd2b817c0130f3ce357cfe91c739c210c8d8325b61a9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier. It exhibits characteristics of a fake CAPTCHA lure, designed to deceive users into executing commands or interacting with the document. The presence of numerous URLs, some pointing to compromised CMS uploads and link farms, suggests an attempt to distribute or host malicious content. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://lovellreunion.com/clients/4/42/420738e4954c29d3cfd02fdb1bc9139f/File/jebevosuxur.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608444172cd7e---lezijawisajivitogojog.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/1b7ccf798ec368799a9e65d0b526b23e/93593280437.pdf
    • http://ecohost.ru/pics/images/file/25246688065.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9461980ccec93308c8593cd30c0b6886/tumegewogejasowazobed.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e74f25dd---59702827004.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5456da037e1aff72d2e670c44e4a1b9b/7502713440.pdf
    • http://tantex.org/tantex/tantexuserfiles/file/45762298343.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607484fa5d3cb---57555688261.pdf
    • http://bellina.pl/userfiles/file/kafunudikun.pdf
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/e89ff0cc7b6f6458a230d22284c5b3f6/5162490371.pdf
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/2154940196.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/71c660a6ea4d3c49d5f43db09b725e8b/99964763872.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f039cd7d211ba416fe7d0f8715f2f7b6/laxubaxonagugolabumifeji.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d72a6d0188b---43431300844.pdf
    • http://www.agenbenangbandung.net/file/mezagenowutusokoda.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/0d55234d3746f9b6341feb01c488e77a/vuxerumimufubepubiroba.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c3504314d4a4eef062ff10ef999da184/44545591183.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d2511dce532---13169847376.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe82269f80---divajirikepedazegu.pdf
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevizodefepuwezajuwogo.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be88e93e811---gogidexaminejiw.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160821d1fe22c3---ruzetesifajenitokem.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/88d5cfcbdf371f91f377803c62b0b1e6/jifumefozufivaxijej.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=garena+free+fire+mod+apk+obb+unlimited+money+and+diamond
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fae5.bin
e30ce27d70952a36b67d6c2f72109b08ea88a8a506eeac3d0ab6a2c73bfbbca8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE5 10976 bytes
font_01_sfnt_off0001141d.bin
49ea0c1178f3e0990ca5c3acaa8e21e12f9bea1656e655e10964a748ccf40e7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1141D 18152 bytes
font_02_sfnt_off0001429a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1429A 16792 bytes
font_03_sfnt_off00015aa7.bin
3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA7 1672 bytes

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