Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c06b3b44e2ff49…

MALICIOUS

PDF

96.7 KB Created: 2021-06-26 07:07:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca45157ee7d6d2d0d9fcedbf4e60eae3 SHA-1: cea9dbd3a641626dcb38340ea6eac934ace1ad5d SHA-256: 88c06b3b44e2ff49551cf7a20260dc9ce06e75c16126d60ed36dae8c7e3cc878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to obscure the final destination, likely a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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=bengal+tiger+conservation
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/phbof260f151unf4bere8gpkbh/suxemidezakifixexonufo.pdf
    • http://konemara.hu/userfiles/file/961143063.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/722f3fc9c6d35797e427ec0488c86ce2/zutan.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/bcl5tse8sdc470otf6b93lnbcu/11595729163.pdf
    • http://bonfiremadigan.com/uploads/fckeditor/file/89374235134.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/tajepitedemoxewemodozig.pdf
    • http://udokutscher.de/gfx/userfiles/files/54288076159.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f281151c5---91983642128.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/hp7ck5eh78sfj0aquuqa08jvc5/6854648229.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2796557b4---83322825973.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22545853826.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/lgjrlcnb95rf8th46c50ipbkp2/60628024348.pdf
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/bea865231d6688218be3d4df926bcd99/bevesilojop.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ba990dca1---bobabomuve.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d0697591---77211163478.pdf
    • http://sunarfactory.com/userfiles/files/99314246030.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d9f9e346c---pobevetetuwuwurobi.pdf
    • http://munsusa.org/userfiles/file/20210515090932.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a02bd31f5a5---30185496496.pdf
    • http://infoegrafica.com/userfiles/files/viwidovoxekaza.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/331bb2f9f096fac78f349a34f28ef2db/59957736220.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d246b0fa4f---lekopitevobogewi.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2d1bf0c442654b5d3486ab2b90f873b1/lavetudubula.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001177e.bin
4890e66ab6a2a06f74bc16d976e3b691d551ee4d83ded1a075b38450e2592468
pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 10524 bytes
font_01_sfnt_off00012fa0.bin
c9edf327a0a58092de8680998b3f6344db2f92bddcefa5e3139cf0342745c024
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA0 18196 bytes
font_02_sfnt_off00015d80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15D80 16792 bytes