Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4fc874d29f76a7…

MALICIOUS

PDF

93.8 KB Created: 2021-07-01 11:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4443f55f3a1265626bbf618f9088f74f SHA-1: 714829769cd9eb72f28c7b9aff7692825d15e045 SHA-256: ac4fc874d29f76a7da35524e116372478ff14610c6f1935309e5f10e400c8546
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting. The primary purpose appears to be directing users to external, potentially malicious sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fd9ddiluvl2ad2rgbtmj1hupro/44450974007.pdf
    • http://beveragesgs.com/userfiles/file/finolimimigu.pdf
    • https://watertorens.nl/userfiles/file/sigorepubutelumarekojax.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0e38f05b0d2933201ddb3fe817ffdd64/nekow.pdf
    • http://songiadabinhphuoc.com/upload/ck/files/84100990874.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c724f0246d---rameresojugudupu.pdf
    • https://aradmissions.com/ci/userfiles/files/gefipagoworij.pdf
    • http://bensonlandscape.com/editorData/file/43864436668.pdf
    • http://wojno-stal.pl/pliki/file/zerofanalixiwanow.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/453193301b0fa32d2385ece385b4ebaa/javemikuvased.pdf
    • https://eyetracking.pl/userfiles/file/75148527025.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f10861e1f---vipaduxorajog.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/9d04002718168c6bbc8710dc5665e1a7/33948957440.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/85d4fadfe59ef5e079f5d810733017d4/58379565889.pdf
    • http://afgventuregroup.com/cfiles/file/domoxoferidida.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/08f0c12c6f83e292cd6f5a1c00a0e4e6/kemovilod.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/355b905f5b3debdad6ee36ffa8fb9528/zatogexisuxemorima.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/d3f92095b6fea97cd1609af77f4da423/futusunavim.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a955de579---wigudusal.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609da3a02af21---3634270186.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076365db1234---luzemixo.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/38bafddf110fc90b0132689f13e6f18b/dubazisuvipuvurelexeko.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/c376e141ee9adcaa39bf80e07f39d539/kugobodefedoxotedowomubo.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/98620680604.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/febe05c44106434de627bbc4148083c0/gujutakepiwivinujorasej.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=square+meter+to+hector
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d9.bin
5cf00bcaf1de25ff927a7f94aea0760d347919ddea20a08ae2ca3e4b37bd3433
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 24592 bytes
font_01_sfnt_off00012ef6.bin
2f880d639eac30e3f50898196e2fc37646c3bb8c5ec616d9030e45724e191312
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF6 2120 bytes
font_02_sfnt_off00013865.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13865 16792 bytes
font_03_sfnt_off0001507c.bin
2a0dc4fa46fe7f59d6e6ddb0e7285463b459cf5b73073c16d39e14fa8f5d0547
pdf-font-stream PDF embedded font (sfnt) at offset 0x1507C 10404 bytes