Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6726d70d1d735c8…

MALICIOUS

PDF

89.2 KB Created: 2021-07-16 15:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ccfb49904b07f864ec07bc11f1a9e2dd SHA-1: 0df2219c6a2652a8d8faffe55988e22a3a44e2b5 SHA-256: c6726d70d1d735c8f4e5d5fed645c3ba3be8928162ae9766ea380c8fb1c89fef
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and does not provide clear instructions, but the heuristic firings and URL analysis point to a link farm designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/b1b9247cfc9a4aea7319532573d44c83/luzupibumapuzur.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160827ad45da5b---92771352753.pdf
    • https://driftwoodcc.com/userfiles/files/gugumodowol.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/7d0ntv4aqh1is5icmjubmph0hn/kisevogenawawu.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/2567363199.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b1cb4e5e---67733469479.pdf
    • http://pension-erlkoenig.de/img/editor/file/gawizabu.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/966e2555ca71bedb1b8244dbcfddcab5/68974169434.pdf
    • https://marblo.com/app/webroot/img/files/81864255195.pdf
    • http://hondatayho.vn/images/ckeditor/files/58711665506.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/19n6ebjoop88n6q0pnrr1oi873/51325902020.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608922e365f42---kimubepasidote.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160719e7bd64cd---20058273497.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/1f07e59657073926873f93e234793dfa/patevizulovadupog.pdf
    • https://luyenthitoeic.info/userfiles/file/nawinomowo.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906d595a0f8---13570010302.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ad5f2c791---zisepejevixiloro.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/bivobovudizaferemabijoj.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be11206db---xisek.pdf
    • https://autoprofi.ua/userfiles/file/62127824248.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856942b54e2---javakofoju.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/iq23bg2q9hsvqecgq0rouqenre/79795949274.pdf
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/63280217404.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b8f4a8699619084835cd05f41091959e/kagidisukikorosixo.pdf
    • http://euro-ex.net/images/blog//file/61736624361.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd2a98e07d---jusigi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=structure+and+types+of+muscles
    • 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_off0000fb00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB00 16792 bytes
font_01_sfnt_off00011317.bin
41173324b6bc942ec5aa51d3ed9fc20d81e20e49dfa89ef0b7b39142dd5c9e31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 10980 bytes
font_02_sfnt_off00012c99.bin
9ece413c22568f617c26f2dce11beddd64b453ece7a053e419845f2a323c8754		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 16440 bytes

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