Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a8eab29749338d…

MALICIOUS

PDF

69.3 KB Created: 2021-07-08 10:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05dfec4210d09b4a2c6a2afe4e0052d0 SHA-1: b5cf05fc75d1491f23939b7bbb8b02abc9a7ea75 SHA-256: b3a8eab29749338dc3372e8f198a96e1dbc67c86a286b24759030afcdff575b8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS platforms. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a5c0cb894---57784525004.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/p3qobnt2c25gs14npmvikd6sjj/wogodurufewiboxutazek.pdf
    • http://www.aamuhsv-madisonalumni.org/files/files/penusigefusigategezed.pdf
    • http://dok-vo.ru/userfiles/file/53586629692.pdf
    • https://ipic.vn/userfiles/file/zopivuniwiwokixu.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/77898092332.pdf
    • http://neodentpetrosino.it/userfiles/files/36827758167.pdf
    • http://hzjksj.com/images/upload/File/zeruwoweratem.pdf
    • http://akinmedical.com/uploads/file/76598548514.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc27c23941---kerojunadewaburigobon.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ccc8a9e76---76226730453.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/253b1cd3a4b0aa73081d990bf6d2bbab/62127533549.pdf
    • http://antwerp-reefer-tournament.be/argt/files/23365307814.pdf
    • https://prawobrzeze.info/userfiles/file/jekijoxaj.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/j8dv2rdb2ldnu9nnf81uuulcvm/95919348533.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1944d6bd---527336192.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd18600281---99853465044.pdf
    • https://banghenails.com/upload/file/28435045012.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5fc1fad9---wepokotamararemosetubawad.pdf
    • http://southport1969.com/clients/861680/File/6414530139.pdf
    • http://3e-recycling.ru/app/webroot/filesfiles/74176107841.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b085c1bb757---taxeniduvugade.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35e1c5c3d---sawewifekaz.pdf
    • http://cbwmd.com/uploads/Files/dakosuposesoru.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab88bf45d---fagipofeju.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=from+liter+to+m3
    • 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_off0000b4f2.bin
36256215988121e644c8bc7a2a6fc483bd528bc77665951ecc4ea1051eeafeb3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F2 9984 bytes
font_01_sfnt_off0000cb0d.bin
8fe0c1c4f0d474d893349f265f4beeb78616317cae0f836e1e2123145fac2bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0D 14724 bytes
font_02_sfnt_off0000f022.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF022 16792 bytes