Malicious PDF — malware analysis report

Static analysis result for SHA-256 870df3ab2894a8de…

MALICIOUS

PDF

76.7 KB Created: 2021-07-09 16:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 960a558b830ca90ee20bed58e52a23bc SHA-1: ef47985f27259e33988ec7d1b348ded71dbda387 SHA-256: 870df3ab2894a8dea1fc2180c7acdabdbe98ea9839c47cd330fdb76e00a6bcef
156 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. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites and other potentially malicious domains. The primary purpose appears to be directing users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://laborke.ru/uplcv?utm_term=divorce+song+by+tammy+wynette PDF link annotation
    • http://boisehighclassof1965.com/clients/879780/File/33593006896.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/poakcmeuc5l04vsjqs1f419qgb/81672515975.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/43259c8283a4ecae8cd50888cbe76a8e/birekaluwanojarupino.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/xexemoridu.pdfIn PDF document text
    • http://sb-78.ru/files/file/surugujo.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e745a4dfd3---jotefapagazavajo.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oa0u6hbo8q84v159ph10jbm9m7/sosipu.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/30415949541.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5s1jspiq6a66ru5eod9m9nfjr4/78186580009.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/nariv.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f9c21af0a41765c0c3c561abdaf16f3/2561038779.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/wewapitemipajabinukifad.pdfIn PDF document text
    • http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xetawijufaluguzisupazax.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c13a7ad0f8819b90d04e6cc9ab578652/83463183821.pdfIn PDF document text
    • http://nakatka.com/files/file/dulagewukexuxo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/3ee0e2c16ed18f48cd567fe3ec370efd/kadenu.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/96460276074.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/44778142558.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/372f68f5b3cc3e98776c48592a10a37e/potimenepoveluxoduwudin.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/771dbde639f1ac624488713cc2c1de09/99087687009.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/e757ebeba75c70f2afbc635db06eb4b6/97102833977.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c775b7ade5e---sorosamogaxuwubagifo.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_off0000c670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC670 17400 bytes
SHA-256: ac0474ffad39086ab25fc96a135b1cb65000e97d2fa35dcc332dea8a163a58ab
font_01_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10936 bytes
SHA-256: f4db81d486421df046470da96c86f087655717abb4d8c9a941ed9b8d5ed34f68
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.