Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdfe064eb37fa999…

MALICIOUS

PDF

98.8 KB Created: 2021-07-01 12:19:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 79571680b7238cfe3eb6358d7efdfcfd SHA-1: ac6b33d0c9f4d7464ccd645b597b252eec3ffa66 SHA-256: cdfe064eb37fa999778791760f74053aa0af9e9e7f3ad50173958a526f7b6236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malicious content delivery attempt. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to manipulate search engine results or redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 https://pistant.ru/uplcv?utm_term=canon+100d+manual PDF link annotation
    • https://liniagdanskzydowo.pl/files/31588663912.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/0f978554e2a211aeba001facfd92aac9/seveta.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/c6e66d3f13025f7c1c14459c96044867/tavipati.pdfIn PDF document text
    • http://nakatka.com/files/file/74925147121.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/j3i20hnrv3cdshu7i8kqu0sov5/18882731043.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/87545529642.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/f660f9dfb8a12306759b4eca7c0a20c0/57538057971.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/n6vj60752mchepjprc0ll50ilo/wupuxuvexoga.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1bfcbfbf2---relomuzaberesozejunibo.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0kqbqscl346oagcsf0g3fk7qg6/jezasawavarose.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808b07a304c---79199097941.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c22bd7768d3---87596575888.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/udjfpm0plshu718ldhus6mce4r/mokijowelutab.pdfIn PDF document text
    • http://surtek.biz/image/files/20150121_132909.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089f11d43d04---pumekazivozagepu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094db9416988---xegudapedubogi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160d43cc323c68---manofexewaligasefufi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/wawebobaxagar.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/58359393107.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/divedexelixetigigek.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/84924366062.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/bigonorelutozinib.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/medij.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7E 10124 bytes
SHA-256: 9e4296d9abe7f97d29ea2cf8381610e63a7bcbdce5a36a9a668b61ab4c38ba7a
font_01_sfnt_off0001340a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340A 18240 bytes
SHA-256: 4da6c861e6ebff32806df15cfd1bcb060a4c7f61dd40b19fe7d4cf7a3ec26d36
font_02_sfnt_off000164f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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