Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bcf6f140c3a1d03…

MALICIOUS

PDF

85.4 KB Created: 2021-08-03 13:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b7daaea7416bf0d3c83d7437a1efdb6f SHA-1: a1653618899841f2d58026c4aec48c9a49879b19 SHA-256: 2bcf6f140c3a1d037cb4d62b2d7f9af5e67697dd9ddb3532bdf87e06e0183e79
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs that form a link farm, with several pointing to compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://chcial.ru/uplcv?utm_term=bahubali+movie+hd+photos PDF link annotation
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b9022630b72---82654163222.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4718438b449e23cc340f4f75aaeecc09/xuparadufid.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/noravewobesepuwefinokup.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c7d8c1ac1b9c7e9dbd077ca883a336fe/zobabugosadutuvexigu.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/wesonamerovafoxutov.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe5831da60---82213620895.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb96ea65c70---gumotujirugibovaxosob.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/a4n6vubnk1sqf624lig0sveeuk/31699890198.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d031c21bad---kakatovu.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/3ccdb5bda6ddd8d3f5e998ac2c2c217e/xosojivelijirudezegewa.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/rifuvinixamalikevokivi.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/67913995824.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/rorupomaxirofaweb.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/fawavoxobujizowe.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/97100035511.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/43572401825.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/gefukigovadodixoger.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/vulasosofidifitokaziw.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/bixanikaxevenox.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/63c0o0niql1r8ip20arle5u44j/5856563753.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7f0f03c3ee560c4e224268dd85dffd9f/75827897979.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3436a7b5c50bb27b400d5ffa437cbf59/88027471799.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/61464017644.pdfIn PDF document text
    • http://imi.vc/upload/files/gudisemifezuxebi.pdfIn PDF document text
    • http://skomi.ru/img/files/file/95898812399.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/buledunezafokeluzitobibi.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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 10812 bytes
SHA-256: 836e4eb9bc00057c29c6125d814094e4dcfd363601b2943f58d6b39e7b412a6c
font_01_sfnt_off00010259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 17380 bytes
SHA-256: 2b60f33d5246dd9160ebf1f9581d3d8bd306659993f2885a86002b57dae91107

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