Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdc2d7cc3edf06e0…

MALICIOUS

PDF

78.4 KB Created: 2021-08-20 20:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 746837bbbc5ee10ef832b8b01b98b4dd SHA-1: 6cf77005c75edcd08e77b19acec5366b62a83d5f SHA-256: fdc2d7cc3edf06e098d4264ac3f0efbb7e700f2b84fde89ba7e0c6100c65db86
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of link farms on disposable hosting. This suggests the primary purpose is to lure users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://tpk-m.ru/files/file/darasawotafa.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ldlf4vge62koq7timnjo1addg/kagafur.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/5607179527.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/zusaw.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/jokolulewibomimip.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/fologomoxefij.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/bosenakirekixeronaf.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/54416102700.pdfIn PDF document text
    • http://moristas.com/userfiles/files/timat.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/xufuwazav.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/c86m3qph0625tji4qnipeeu2e1/fagumab.pdfIn PDF document text
    • https://luminex.pl/upload/file/35349609862.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7vk9rlr510c8dspekp21o1rdu3/28565038017.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6404b71f5---bozadu.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/95322506503.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160758f8e0b3dd---totuwi.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/lanomugazulipuwu.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/90aouplkqpf4983m667p4k6rsr/46597302790.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16113392d2e989---gekikafowidorexaxemakil.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caee7e499a---divogezekafuvizi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/88685382640.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2dee003bc---3248816179.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/63750538674.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/32450024170.pdfIn PDF document text
    • http://hncastlecable.com/d/files/zesovugukoperuz.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108ab3b07b0a---dulivalawizixugasewi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+hound+of+the+baskervilles+test+pdfPDF link annotation
    • 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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 16212 bytes
SHA-256: 522fd89019d88b185670d7abc7d15b714adf73748d01d4e5f3c0f34c5d990b8f
font_01_sfnt_off0000f9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E0 10956 bytes
SHA-256: bd94061202b4bf8c0e670b4d581141d2c8f60ff2994d2383330b9028f1f4229d
font_02_sfnt_off00011306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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