Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db3960df89cf392…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 15:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e5401060406563741dbfe662c8e0bbd1 SHA-1: a8b3ae49533da04bd12b3b8c9bb9a67032a26dfa SHA-256: 2db3960df89cf392b6d9c4ca1ea3a5fb686e9e9005997411d8a6d17dceeb4103
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the ultimate destination. The presence of external URIs and a 'download button' lure further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure and URL destinations indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=xvideoservicethief+os+linux+download+download+kenya PDF link annotation
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/5ii0he1ou8vjauoag1v9oj1h50/38059911179.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/lanujusowu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b5cc1b157---45975983183.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/rigelusiw.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/kiwumasogadelefonudiw.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/bisexikuzo.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/1889962087.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a80acf221ba---nukajosadojigapi.pdfIn PDF document text
    • http://datev.hu/ckfinder/userfiles/files/vufikas.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609f546f3ed7a---kowugigupebiloguxoru.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b204cc128f9---kederev.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kv8ftct2hjs3dkgjtor25tjfga/wozokobar.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210720204741.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/68204287925.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/97565779390.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd62a2e1b---fumuxojazegubowuvuwagif.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/jemewitogufijemuwi.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d43s4ps3v9tf89snkjc8p8uk30/51646410321.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/39764206443.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tekutaj.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/keguxunemifururiwire.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 18640 bytes
SHA-256: c9566a477ac662f71bcb7b3c9f5868ffac1c056f7b736af4c029f52b4dde41ab
font_01_sfnt_off00010c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124AD 11140 bytes
SHA-256: 9ef4770b30fde0c510b508134f023cf9cd3f75769a06c3d00648c0be14efd803

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