Malicious PDF — malware analysis report

Static analysis result for SHA-256 751227d4be813ee0…

MALICIOUS

PDF

86.7 KB Created: 2021-09-06 09:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 989ff11386161ea93679ea019fcffb43 SHA-1: a6a7f14d0f3c0653a73f860e47aab70196071a1e SHA-256: 751227d4be813ee03b02ab280d22ea9c2fe67e7306fa0f0065929482ce72aa03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely to host or distribute further malicious content. The document body is heavily obfuscated and unreadable, but the presence of multiple external URIs and link farm heuristics strongly suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=complexometric+titration+pdf+download PDF link annotation
    • http://tochuchoinghi.org/files/megasamefamiravix.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/a233e0b16a1a0d4b6c290db1cf65808b/67570438078.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/f9946b31edacd6744b141f9ccd0e6064/mugajiziguxidubotow.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/fed38aced010e5961c8c72997236d208/93875170803.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cabdbf57bdb27d5e80e0d5600062fb1e/51275800341.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/goxozufoteguwi.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xawiliza.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/21721854976.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d3d5c43a1---67314683787.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/60962563520.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607223cbe8adc---sosukuko.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/8ab2bcdcb1abfa174225762cfb166d52/55356909449.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/pulugatinokovopifitavomo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/ce9d274553088bdae27dda8034434a79/19219909748.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/fopoxuj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/57a0abd5e8ff3a31036267ef88326780/moxupinepoxawaradaj.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/37115340603.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v0lj6p1378j9sggevjn2r2jv9t/verejusiruwojir.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c49a14657e4---xitetuneda.pdfIn PDF document text
    • https://masukpt1.com/contents//files/tezowux.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8081b52d6969dbfbd7e8f585fce9bbac/nivogumonulete.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/870b534ce1e13992d03fa9be108b3c2e/14016838543.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED14 18092 bytes
SHA-256: 223219d8224be696f195e7217069872f7f3ed569a7474c06d866495b94bca84f
font_01_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13430 10832 bytes
SHA-256: 70bb17e2faa678140c8463095b8b177573f6703c1d9c6495858d2a424d08ab30

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