Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da881c4c66957ca…

MALICIOUS

PDF

86.4 KB Created: 2021-09-05 19:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe59fe3ec8b3ab9f173cf544c7fe19bb SHA-1: be4eb5d0b81f9217e92080223b9700a73634691c SHA-256: 3da881c4c66957ca1bbd4d4ff89155e2b157e284abfa16cf72de7221d023e53c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of multiple external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crewmak.ru/uplcv?utm_term=globe+valve+working+pdf PDF link annotation
    • https://xlspandoek.nl/userfiles/file/69316994726.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/88affd93b41787713e25dfb7beb86a7a/85178882506.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16082d051f06f7---53830633962.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/d0e08b24c192db0193ef8d183ff6d983/pigojuligotoso.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16129758bce0b4---49842754067.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ada10919450---40690305331.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081c77143682---89764985882.pdfIn PDF document text
    • http://volker-issmer.de/userfiles/file/41559247695.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/gufapevalijovirezerukido.pdfIn PDF document text
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/3183fab0560a567e59791bca2354bd2f/mefonaso.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/22545606066.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/0lesr59aiab6ve8n0n20t8g9ot/58589921086.pdfIn PDF document text
    • https://aznamaste.com/ckfinder/userfiles/files/fosumiseke.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/191320e57c44c9678f518c1c8436e8cc/17932326932.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/sujelilebugo.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/51350704172.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/nesamefuzoju.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/ginebaxadiger.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160943a632c850---26056457562.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/fefenelovivukewowa.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d5b1c81620558aca6fd3083a7950a968/39148594858.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/rapuwej.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976c81dcd81---gitozubonaromimazodenomo.pdfIn PDF document text
    • 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_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10390 10832 bytes
SHA-256: b5d2b968230064f85ea687b32cb1705cd8d4be481aea8a0c40ede0995d971f79
font_02_sfnt_off00011c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C40 18112 bytes
SHA-256: 272219bf3dbd14fa4416c2b1e5b9ce24377e9dbbb781e5dc6116e90693b1948e

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