Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b6743cf3a632004…

MALICIOUS

PDF

93.5 KB Created: 2021-06-22 16:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d46e2c74b7e801c0aa42a8e6aed2876e SHA-1: 72eb17b805421a997529164b6fa61cb6818913ea SHA-256: 2b6743cf3a63200453c29e53ae84ab488c1426da8eaaf63b9649f35d09aa764a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is detected as malicious by ClamAV and an ML classifier, and contains numerous links to potentially compromised WordPress sites. The document body, though heavily obfuscated, suggests a lure related to a 'quality inspection checklist template'. The presence of multiple links to disposable hosting and compromised CMS upload directories indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://camile.vn/wp-content/plugins/super-forms/uploads/php/files/btg3apedtqni37lb4hfjddp8t8/11687180244.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/k8p7qkh2983mp4bct66997c2ta/80004424709.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f77b721915cb973a0b8e37a6364ba221/11059333185.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/f546261218b9438c3fa534befbf67b22/jujiz.pdf
    • http://candybeauty.vn/upload/files/sulesazikudibedo.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84af695a48---81496355248.pdf
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/nufowu.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d615f0cad---xufewikejagula.pdf
    • http://poltinik.ru/userfiles/file/dujawizuxaserakav.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ed83c2fee1914de278031bc1a357eda4/legosaw.pdf
    • http://ahkjt.com/upfile/file/16490508307.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file/%5C/20210515105413_957159452.pdf
    • http://asckhn.com/acskhn/userfiles/file/84918635615.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rrl78ou9ef9fhodg3qtids82v1/24490978901.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ad7f28fc13d713f487233087d805ea9c/13495787877.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607876912cebf---66354881316.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/fb25c53dde5078f2a51f49424e30e840/87339378670.pdf
    • http://apartmaji-zunicmile.com/uporabnik/file/zosaborulonej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=quality+inspection+checklist+template
    • 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://scripts.sil.org/OFL
    • 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_off00011b6a.bin
fbc31323fb34ee46cdc82ef2d9b699979cc62edd89486cf1d4ce4d3b28364ee2
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 5304 bytes
font_01_sfnt_off00012d56.bin
d8dbff2579c3a94a7d04eb0428f2f70c453c8c4d1b6f77f272ad9e358ea54c0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D56 11264 bytes
font_02_sfnt_off000153cb.bin
7e28333d71a2e4573b221cfd9371d800bf7c4d3f8dd8c76d056b2d1db0f3cb40
pdf-font-stream PDF embedded font (sfnt) at offset 0x153CB 16096 bytes