Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec3b6389394cc1fb…

MALICIOUS

PDF

89.1 KB Created: 2021-06-13 05:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2ac4c02e996380a2d2a85da58f4ec591 SHA-1: 36a3a98b7dde405afa837a28fe1d2a17ae42deb7 SHA-256: ec3b6389394cc1fbdef7990273377f93464db6405adb73748d52d97295d93299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URIs and link farms pointing to potentially compromised websites, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the nature of the heuristics indicate that the PDF is intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pixomot.ru/uplcv?utm_term=conference+room+schedule+template+excel PDF link annotation
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/15638dff27ec5397549740a7abdd24ae/34896686973.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file/%5C/2021051920200410.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160716d407d4e2---51823203051.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3388253fe4---laguneminu.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/83a7cc9eeb013961d1a455ca5ce06a67/vokafumugakutugixowiku.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3c9947dad4e773a5795091525344f1ee/gozosu.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/93929541861.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16095a731edfe0---16593872826.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b12f701b8c423e92e7603dd5d9dcc863/pelobusuwamujaxigufude.pdfIn PDF document text
    • http://land89.com/ckupload/files/detagilajow.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/28e3e61a4b45a120140cce97b92a737b/tatinuxeruresubajovuvaxi.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0df683b71---45347133226.pdfIn PDF document text
    • https://chp-travel.ir/data/file/28094581347.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92664ef46---88687741517.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abec2beeaf---riwawujotizukota.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11365 5320 bytes
SHA-256: 1023407ea03aeb61aa4ff6eb1ef5af0b3c3f2b759942f2c2dc3bb691f52422e3
font_01_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 10556 bytes
SHA-256: 70cf42cc551d881e0b58e6c9e9f35dde333fff84816bbfb3477113b57a20b5cd
font_02_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333