Malicious PDF — malware analysis report

Static analysis result for SHA-256 e04f12d37c28a114…

MALICIOUS

PDF

77.8 KB Created: 2021-09-26 09:01:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c89d5624c5b4874f70243d220a24c241 SHA-1: 00c0451df42252e434aaa2d1d853f8653a67096a SHA-256: e04f12d37c28a11457857e833931246e78a7422b5d2446fceda0ed131e49a6d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, fitting the pattern of a phishing or malware distribution lure.

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://collinite.pl/userfiles/file/37726285287.pdf In PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109151527564730.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/20805165024.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c63bd80a5---kobagu.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/fokelorapaviparunaz.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/wutave.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/08ee0cace69a4223aef2f083535aa856/gefosimerewijokidukanovog.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/10169765600.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/81662460382.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/56608186556.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16141397d4af9a---mefesud.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/53873950759.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/35466644554.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210914/file/1631571701.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/vurolawuzanubipi.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/36673227969.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d3f806cee5---86824894540.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/24650465114.pdfIn PDF document text
    • http://devitohomesorlando.com/userfiles/files/85429335855.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/42461619110.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/59865752530.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/zekudemefivu.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/kezuworifimuva.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/96836083946.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=netzwerk+a1+pdfPDF 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_off0000c385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC385 21460 bytes
SHA-256: a455b40e624c28860c05a0d4efc2c1e28c316e1a61105d1ef743c96153ae354a
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10228 bytes
SHA-256: 6fb4ec188b910f6c09a3ec476098a2a9baaee6d5d0a3710a48ba407df64afe14
font_02_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1