Malicious PDF — malware analysis report

Static analysis result for SHA-256 a726e81669efa08b…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 17:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84bba00de5a855d0f0da2e5cc765a6d9 SHA-1: 29996f085bdef531b606fc45f429f4c0455e32e2 SHA-256: a726e81669efa08b97bdb6d44b7d3b29913e86f4c1deccfe96ee5c6cdd687a35
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://ketchas.ru/uplcv?utm_term=synonym+for+no+longer+used
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b8035e47---bivufanoziri.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8n3r6em86j7hja2sggbkc1kkng/fawunerijapinulijidele.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/19373a2815af436fb7e354fe890f41a8/jowezo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/q8flkook0go2imbufe8ucteh65/geramis.pdf
    • https://tlproduct.com/userfiles/file/xanasidaxip.pdf
    • https://paron-rebondir.com/uploads/files/31350442779.pdf
    • http://evergladesharvesting.com/ckfinder/userfiles/files/gedoxomesexupun.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/555a19b87ce767ebf07193b7b3dd7e2e/85285440748.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14449d12---tiwasurokuzulibejujiti.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f94abcd049---47316745295.pdf
    • https://baongochoa.com/upload/file/87566800772.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/7cbab012d990e755b05df93ee6bb805f/dofabafol.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16086fcd8ab847---29949097680.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9d528803f36c1980eb33cc38771de8e9/pegibogubuzap.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/548d7e9fa4ebbabed1007fcfb0eef002/tubinavitiv.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/aljbqhp1a6mkfk2o3oe7c1ed5c/sazamenojonujedipetete.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/295721baa02037f4a24a3d0614ad797e/rodoxaxixafi.pdf
    • http://hanhthien.net/uploads/file/vunagaxupilejasobota.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160aa30aaa7c09---gedugexixepururaw.pdf
    • http://guides2alpes.org/uploads/file/30034585168.pdf
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092e3dad8cd8---89794166145.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3cead7e73d9624e73d2ec120d58b81b1/samagitawoze.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c716f269025---jowagegelugabofifilokulix.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb6723af0---budiritof.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_off0000feb4.bin
ccf96b749a0baf5981dab8acc97c7686ed7484c065dbd70e48ecc52600bda22a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB4 10632 bytes
font_01_sfnt_off000116d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 16792 bytes
font_02_sfnt_off00012ee3.bin
158b5d2f642d413c406ee04289417b73e50cde01ffee7bf53648cbab46f89a7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 22240 bytes