Malicious PDF — malware analysis report

Static analysis result for SHA-256 51996691f562cb3b…

MALICIOUS

PDF

92.6 KB Created: 2021-06-28 03:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc1be917bbfa1a58869db48655035ff5 SHA-1: a43998b4f4e3bec1bc940e33ac1001f7af3d1ce7 SHA-256: 51996691f562cb3b99ec5f18404833cf9ab534f6df59d4eb4a548b9951c967f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it is likely a phishing or malware distribution lure. The file contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the presence of multiple external links strongly suggests an intent to lead the user away from the document to a harmful destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://adamlegal.com/userfiles/file/fewusotitanuxaxiwo.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160822f849da5f---posedolazozovu.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ba393820ce312e6d8e7e91958b7e719/gubevetemaxowuke.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/d6a122fb5d69879f31bc4ed128d7a057/newino.pdf
    • https://planet-pvc.com/upload/files/pizaxid.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607194e4b59fb---99363147843.pdf
    • http://zaun-produzent.de/userfiles/file/29952595683.pdf
    • http://blevy.com/ckfinder/userfiles/files/guwilodinekaresekejeb.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b34298aa35---durilalavoziparitu.pdf
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840dd897a9a---kalovuf.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/0v6v4tmasi69ee1nnuh3opjete/gosukarejotomonelibusak.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b84d7752e---devetikukoposolot.pdf
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jopixip.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/j5diqu2tpgb57432462jdu7cjs/dalitomosewo.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16086e44e05418---lapuvisilewomegeku.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/50027f647efb835c2edbdf0362a6195c/riwisakenesodonixu.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ff1d18dbb---72832408736.pdf
    • http://elturo.ru/img/upload/files/xupolapojo.pdf
    • https://bcbc3399.com/upload/files/toxefamo.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b982a81189---goxopazep.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094d668a056a---71550980100.pdf
    • http://familiehollander.nl/images/uploadedimages/file/3752063008.pdf
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/51354156759.pdf
    • http://rszm88.com/upfolder/e/files/20210620210124.pdf
    • http://aeronautike.com/userfiles/file/91721469011.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/urms0sioa2l3nrqb1cruj7a4u1/4380595595.pdf
    • https://okna-stv.ru/userfiles/files/konutikoj.pdf
    • http://www.gesas.it/media/mailinglist/file/jalidopolefabapemebole.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=upper+second+honours
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107d1.bin
64db9d716737089bc8ddd3daee0502eb350fb899c1c89e4d7c63864284cdc4fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D1 10320 bytes
font_01_sfnt_off00011ef6.bin
b7a3ffed93db156f84f502a4b132e79c15ad4b32778da971752dfa72041e3573		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11EF6 17404 bytes
font_02_sfnt_off00014cca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 16792 bytes

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