Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d97f472e847762…

MALICIOUS

PDF

84.1 KB Created: 2021-09-13 21:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: afa1ce6ad9a2d13b29ca9be8a5465298 SHA-1: 2f61767133499900253c44e53083c74a310fad93 SHA-256: 15d97f472e847762bf94325a960382fdf71d72242bf989b6efa9114afda892db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://archism.ru/uplcv?utm_term=plex+for+android+phone PDF link annotation
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c1e3f3fa5a2e5aab650b71a127875944/26977140092.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/1738357964.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/23894129691.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/89174706180.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/90492739202.pdfIn PDF document text
    • http://baoveantam.org/upload/files/41868684091.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613738d3ec1b0---29635913086.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/nugukotew.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/57509309032.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kaziwiwokuxi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/kapijoxi.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/85323152852.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/19598633613.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/lofesapexalunukolufukew.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/kogokogudozozakurata.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/toxuriwalosonamavi.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/vebaborepe.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/jixanezamataruxopege.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/72501375083.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/ee646b142ea56c8adf91b8e2f3efd3ad/tizexafuzik.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/kawidinukel.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/2924771453.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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B73 10432 bytes
SHA-256: 60d5c885154a3e9db6ed990ae9eb82424c4fe51e6033e1af094fc051a67ff634