Malicious PDF — malware analysis report

Static analysis result for SHA-256 230091138b438e89…

MALICIOUS

PDF

82.3 KB Created: 2021-07-03 06:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 739dd8fb17f5cca9dc27f4eeddd70d3e SHA-1: d6a37c0db027d1f57099f0f7b8472bd13589df8b SHA-256: 230091138b438e89f50ee2980cfba397817522bea3b44b5200cd67719d3e3bf1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may be intended to trick users into downloading an archive, which is then decrypted with a password provided within the document, a common tactic to bypass gateway security. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drafthe.ru/uplcv?utm_term=acadia+national+park+cost
    • http://altaprecision.com/userfiles/file/lizefamizozinunepefigewe.pdf
    • https://unosms.us/userfiles/file/jupokaxunivonatajogewamow.pdf
    • https://didacostruzioni.it/userfiles/file/molaxen.pdf
    • http://sugarfree-gelato.com/upload/file/48504934472.pdf
    • http://0vote.com/ckfinder/files/zisinotuvurajikamogudaba.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe3fd6f10b---44341278938.pdf
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1608fda23704d0---76045836004.pdf
    • https://dansobentre.net/uploads/file/bedusoso.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a3017508ff643785c960191dd9904db0/kosifafatizekekawusek.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ea4cf1cdf---3610724683.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160839029c6d7f---poxuvaxodekux.pdf
    • http://hphs1958reunion.com/clients/47465/File/genujusigeladilem.pdf
    • http://jpmoto.biz/upload_picture/lekibeb.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aa2795603---bujepufexabox.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/64303784e8c44144d29edf1649292559/8259695343.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rpvj0tv9prbpomtmg9fqls6tm7/34097912977.pdf
    • http://nw-line.ru/generic/uploaded/kawenakibuwebigamukugap.pdf
    • http://koryosushi.com/uploads/files/teniwunedu.pdf
    • http://msslink.ru/userfiles/files/gased.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d652645e2---51080688124.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/307d30a3b46e29dfc623159c6695f8fc/56246556465.pdf
    • 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_off0000dd5e.bin
21ef71de6f36f79dac9bb708647af072b93279f5e3eae8a1161041b5cd0a752f
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5E 17464 bytes
font_01_sfnt_off00010aef.bin
df637be9791aef26007f9e08ca99a05fd1c04763f5e2a5abd58a88ff493a41fd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEF 10448 bytes
font_02_sfnt_off000122c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes