Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc4fac1ee582fa3…

MALICIOUS

PDF

90.8 KB Created: 2021-07-07 01:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3fefabc8c726803332782afa44f4963a SHA-1: b7d94d1afc4b8a3eca346aa22cc006c9a9b9fede SHA-256: 7cc4fac1ee582fa3a025e2b873cce0769b1f5460fa1448e0269341e98d0920e7
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or exploits, indicating a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caf8c194fab---fezevoretivufabivif.pdf In PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/dc3b3c61904da426a3a3b65a6fe93655/jevogivivisavabemimiw.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608278f65ad21---77963851026.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/27812011141.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/297ba7e351aad4fe23cfc0d704f5854c/16577075678.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/detasexojawuxi.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/ef4cfc73706bcc00714dbd4d7026e121/58660382455.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d00e8321---mikazefunosawununed.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/fuvepufuxirozixojokufunil.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8317ec76---50468476353.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46675cac98---75155640670.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/zasuvukipazoseminexojaz.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fl59t5p0blhmoia0790ta52uf/zuxemiwoxonigo.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/dosujuxik.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/416537d80e97e93ef60d93beacaa47f1/dubafekotap.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16071dbe7c3a41---mipewojefaf.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0a5c0491376af74f32418fc2ec98745c/98967029810.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b46f676be61---podebezedokote.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/62080579386.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/78571291653.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/22974201571.pdfIn PDF document text
    • https://people11people.gr/uploads/File/62686635302.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/694883e263a49d4794a19e719ee986a5/52905832669.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/daluxesajaviputixuzibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=elasticity+of+demand+measures+thePDF 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_off0000fba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBA7 10936 bytes
SHA-256: 8416725294034ab4c7ce95bea50b452a5474957a72bddd2289488708c275017d
font_01_sfnt_off000114d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE3 18468 bytes
SHA-256: f4632ef0919b00964e3679726fcea0eefab50b5460d249d1b0f8095a28d26972