Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71eb38a7bf7fd18…

MALICIOUS

PDF

90.5 KB Created: 2021-08-15 12:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: a92912260bad182bf05c920f9b24a028 SHA-1: a450a066b46dfeb138f8556a8826f828f528a2f7 SHA-256: c71eb38a7bf7fd186a07f463f82ef1a70eb3075eb94e87c12ec72da689ad6e32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6540a7a8---21203088741.pdf In PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/486223959.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/ledorawuj.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aea310b6c---51934772991.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/tokukiditozuwojil.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/fuxarojota.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/xobasokapamaw.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8e7e351436edef11a0634c461e322607/16412949213.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e31375294a6c89a471a484fd5561b81f/nokiju.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d7dd4f270---lokujakubitilazufufos.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c40fab0db43590654ab1b6c59cd28b85/lefinudaxexezumutab.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160797d06793ce---losena.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/21656834663.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/fd4776a87e4baab37b00d40b34f3cc50/sobezarumisa.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071460132b64---mewakuxus.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/kaduxojisorupitatulipukid.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/3c114fd7e61a306e71e678a18d4c3d1f/19894173072.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/24913932066.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210726_47B47263332E4AA3.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/kowopatagusuritap.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/4976fdda1b4238531c45f4407af11fed/90381924239.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0e18d55a---79506674842.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085449f16942---muvixamumaturudok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=improving+vocabulary+skills+chapter+4+answersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A7 11448 bytes
SHA-256: 40129c7a00b7ec721cf3a1afd5244042bfc158ead43c365c48f79ebcd7dc55d9
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 17464 bytes
SHA-256: b4527bb2b93fc1c7ced6ca53bb0db8dbe8b27b0d8c9c6a3ed6b95a4d2829f7eb

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