Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c417a2cd7184dd…

MALICIOUS

PDF

84.1 KB Created: 2021-09-09 08:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a1b48343b91625b0c7180e4102f3fac SHA-1: baee72197f51b846970debc5075651d75ee4eddc SHA-256: 49c417a2cd7184dddf355e26d99edf1a1cdd675cafacd7f4e4e9a079183fb868
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, distributing links across multiple compromised and disposable domains. The embedded URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://christopherspubandgrille.com/userfiles/files/soxixufizemilikox.pdf In PDF document text
    • http://dfanchem.com/upload/files/84469058559.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/68324657146.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c98dadf857a3cf255aa2f5aae90c759a/jimuwezore.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/38271631808.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/62808841165.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b0f3465a4047f16d4c97d9f35a3c0a4a/wojixatunom.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/gawimizimamilaf.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mixoj.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/762073138.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/47916919837.pdfIn PDF document text
    • http://bdnchem.com/upload/files/64765873788.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/gepowuva.pdfIn PDF document text
    • https://printsolutions.printsolutions.bg/uploads/wysiwyg/files/gaxatot.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/55479791236.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/cffdb5261ced3e7c1ae90a0ffb860cf3/movujijepanibiluzovifanik.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/15664391491.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/79676300898.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/firofevezomezibupewazi.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/83747944958.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/jeludugukonaru.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161394bfc5bc4b---85852740765.pdfIn PDF document text
    • https://kattliv.com/kattliv/admin/userfiles/file/mamabutowa.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/wozowepagukugala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=access+locked+android+phone+from+pcPDF 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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 19152 bytes
SHA-256: 04eb5e1f3029f3a542d1d6736497b0eb8d1ac05f4fc33f054f70470ca2d7e914
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 10860 bytes
SHA-256: e9c9f619c270c53a0a7b5ed08d26dbf3eeed846cdad79f0f32434beddaf41b34
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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