Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c6fe50e8f4d27f…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 16:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 39b49235e6bb2bb70bfc268e0a9ca8be SHA-1: 5029a0826542d275d86f74b033a5944df8e6ea16 SHA-256: 95c6fe50e8f4d27fdf109edf5a04c30b4328043fb0d5e68c6b680bc6f098f5d0
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614095cd67cdf---97212254102.pdf In PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/pivivofugulaji.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/dovomovepurijivodize.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/vuweridajogirigigu.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/fuveguwaxo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cec3467bd7ed1f503683128ac3525208/23156266137.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/76555984554.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/97330268979.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/neduguxaluvirux.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021091110241380554.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/9287975437.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/40463081878.pdfIn PDF document text
    • http://retrofotr.cz/files/file/webafeduvolubezagojaki.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/fober.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/satekalesabojav.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/kixogivezuzonejewum.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466e1ad7e75---93413074341.pdfIn PDF document text
    • https://regenerateacademy.com/file/fuginexoginuwi.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kubazajabimugutamasa.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161374bd3304d6---zadekekulo.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=movie+torrent+apkPDF 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_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 10180 bytes
SHA-256: 99eaf2e2c2f87d7ca6269ca50390456802e66a25edfe0f8edef0465939273961
font_01_sfnt_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 18436 bytes
SHA-256: 262fa2493e562b5d7acaf6887d4c78b7b861c0ee809e6c2244049edc0ba3b308
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1