Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d70adb2b6b0a6a…

MALICIOUS

PDF

62.5 KB Created: 2021-06-24 22:26:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 912cab70ee2d248b9dd6e6ab2ae19dfc SHA-1: 36bb3d02844b6dce19e4d0301b8debaa0acccf1e SHA-256: 85d70adb2b6b0a6aafa26b82ad92e2538e24ff1c45ae60433b7b0a64f0b83418
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or download further malicious payloads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest a coordinated effort for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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=canon+mf8580cdw+manual
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7283297e55c7757680faf5dadd2f37b5/17608616223.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fff9a3bdc8---88445239737.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/83a8b1a1fbe420751e320916ef1958e3/zubadokiwagawuxadijusejo.pdf
    • http://dalboncostruzioni.it/userfiles/files/wegajof.pdf
    • https://ancoraeducacion.com/images/zaxuxomoze.pdf
    • https://foulardfotografando.it/file/24301175234.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609569620f0ea---basimek.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078de305a844---futupeli.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/8clj3jhiej80ef8eitd190k293/buwirigizaxum.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5face70c5---panojarexuwax.pdf
    • http://hum-lucknow.org/test/fckeditor/file/bobafikasovi.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af54cea1fef---46953103274.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb54e0cbc07---domusojamirad.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/359ec4fda8939a017ca48dbdac3da9e8/bumewudifokukodotavagoxef.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/9671fc11bdcf172ac7f27b3a63f90262/30429588278.pdf
    • https://euroroma-bg.org/files/file/todituvitokiweb.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/17e2cd26f6c16561237a38534c99820a/leluzubezivukikumo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6d9.bin
05bbce736b6918c4c98b2a93c1f53f6632a0f05d039882932eeb7463ea2886df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D9 5348 bytes

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