Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e6d79fc74ae9d85…

MALICIOUS

PDF

88.8 KB Created: 2021-06-27 09:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 386ac5ee271e4b4a5b9d93edf834888c SHA-1: 2d12fccb1abd45d556d96c0cb1b028ba18785ee7 SHA-256: 7e6d79fc74ae9d8579f191daa0c626922765cf74bdefde9cf74a66645f2cbe28
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple distinct hosts and UTM parameters in the URLs further supports the link farm and potential tracking/phishing nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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
  • 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://laborke.ru/uplcv?utm_term=ac+3+remastered+trophy+guide
    • https://laser123.com/geektic/files/bijaw.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3df6e6a01---lojutoxeju.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4b46e371f527255b9a77320c5b6d043d/55479295003.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/7cldhve6mqb68ek9ll9pvs5477/59946231349.pdf
    • https://agatanorek.com/files/file/44288509373.pdf
    • https://africanresearchcenter.com/userfiles/file/dikowasaxuvekowenima.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb62a6812---2959149658.pdf
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/pomigixijajuxusudal.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781b05df8a4---73781863840.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae5ea54a70---59436125713.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/394v9j7idbnjn9c01itp7cicoa/gufexeluzirutosutuz.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/45c21f3f1d338829c8b66ed3d2d71cfa/reduwujanumab.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210531_AEBCD13441F6CC5E.pdf
    • http://thefjordbaklawfirm.com/clients/876731/File/merit.pdf
    • http://allnatureint.com/userfiles/file/gefarivuvarawomebadozu.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/42n69baanpnhglk04lmjjsq600/18394199853.pdf
    • https://eternalbliss.net/file/wulolopudufu.pdf
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/sobuzeza.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/4285542207.pdf
    • https://ozmutludokum.com/userfiles/file/434707217.pdf
    • http://jamessham.com/admin/usercontent/file/3743946937.pdf
    • https://inncredel.com/uploads/gikuru.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/iqqns377uavvemgq2dgohsvfuc/vujosirafexevisedapenawar.pdf
    • http://degrossier.nl/uploads/file/29625238061.pdf
    • https://artlabjo.com/userfiles/file/85035628214.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_off0000f265.bin
11699b9cbbbecbb8aab80fa387e708c8889cc6b6370813e043a3b31bb5c5067f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF265 11176 bytes
font_01_sfnt_off00010c79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C79 16792 bytes
font_02_sfnt_off0001248b.bin
43912a135b00134759a28bbae5b9dca86b15817ac0123f62cc97db65b03a06ba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1248B 19012 bytes