Malicious PDF — malware analysis report

Static analysis result for SHA-256 b318f4758dea9bcd…

MALICIOUS

PDF

91.3 KB Created: 2021-08-09 22:42:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 141925a96163557b1d5d62194a8b3b87 SHA-1: 9bf377d9f55a65cdd52754f9f265fbcdae44d1c2 SHA-256: b318f4758dea9bcd0cbd388b51d8d623668b1ad317888519f76ec3da777b2c6f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to execute malicious actions. The PDF also functions as a link farm, directing users to various URLs hosted on potentially compromised or disposable domains, suggesting an attempt to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/namezimukozat.pdf In PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/tezemuwelobukevigajo.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///jijevipubewaxorabobogox.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/52409652026.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81ed8b008---75611994353.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wovoludilugobapavi.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/gebipigovopi.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/27519083139.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160870b8e7758e---sujalitutulabovekubuderaj.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a787820bfff---8891494901.pdfIn PDF document text
    • http://rld-carbon.ru/file/kakunuledutexid.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608173626965b---nimexufomitivexujunal.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/jonevap.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/65002119237.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ie39vadj9gul97paetqkvmvfvc/nulokebesejivizimokuxunab.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/mawogujegujovuguwajonu.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/75671115030.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/vifito.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/44440135613.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/af4f42c8f845c6dba445e61df77f9ed2/30977788219.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/baxemodikubilakinarub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=las+enfermedades+mas+comunes+del+sistema+endocrinoPDF 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_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 10692 bytes
SHA-256: b42632cee7d2ade6e937a9d281d5a5ec4fbc09dffbdd04e2f541f18463f05efb
font_01_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 17684 bytes
SHA-256: bf775cd3c91a38c3d1e6ec5c4d774469b268d50e38d2dce99158d08ba78f3a59
font_02_sfnt_off0001442a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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