Malicious PDF — malware analysis report

Static analysis result for SHA-256 f897ebc58ad01286…

MALICIOUS

PDF

75.7 KB Created: 2021-09-12 13:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 191c682bb1994a43858d5fc151542e95 SHA-1: 4e685bf73bf4c21e622178bb26714d8f11da04d5 SHA-256: f897ebc58ad01286f0fa6148b72f9e612868641a7853367ef4d23b425186d2ff
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute further malicious content or conduct phishing operations.

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 http://bratislava.topenglish.sk/app/webroot/gallery/files/folewexamatunu.pdf In PDF document text
    • http://csp.hu/editor_up/ladakadijaxivejiri.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/kagefisaxufed.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/liwadolezifagazabudumu.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/tibikadudobewemivosojar.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/womipoludodevozamijitowom.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/dikapub.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/befosuja.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf5a31bec---pukugijaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a809e44d7f---22249309893.pdfIn PDF document text
    • https://kiptep.ru/file/bodedapegi.pdfIn PDF document text
    • http://thevale.us/userimages/feborenipup.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/pupolufijonevetibodalanep.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/rawuguxedakeku.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/jakosudi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338c397cbfd---napoxefuwitaxiropu.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/dedikorafojab.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad471c0eed---56287157346.pdfIn PDF document text
    • https://btegypt.com/file/sonobiwomelivikamuz.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/besis.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/65463265339.pdfIn PDF document text
    • http://status.cz/UserFiles/File/vozafan.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0banuomsg757k1fsp9eq6qvd5d/jipikaporomorazanitolobo.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bapemumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+mvc+mvpPDF 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_off0000c537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC537 10116 bytes
SHA-256: 4e47d553a8f4a480153b54646fa06fb87a917223fe370cf69514adff08f51a20
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 17276 bytes
SHA-256: 5cefe90cebeca022fc066d7c4955891091e4d95ee58c10bccdbc18d9702f17a6
font_02_sfnt_off00010924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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