Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c75c71e641a500…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 19:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 660f539f84a5b57151691eaa62f96a25 SHA-1: 13c32f333399d1486d1cbb64a4e56f9e5d03a5e6 SHA-256: 08c75c71e641a500c75bb8d4aac3c08c75e6f0f4b823503dd308c9eca8bfed67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pistant.ru/uplcv?utm_term=do+not+be+unequally+yoked+meaning PDF link annotation
    • https://elearning-chemistry.ro/userfiles/file/70188127495.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5d91af9e40d89bcf9be9e3abe521e8c0/rirasasagefosepuw.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/batapotamemalos.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/34358031519.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/nimevipodolaxotikajoja.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-8-13/20210813165546629752.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24607979e8---lefivate.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/06fdcf9197f6a790378f471f721b6076/8789462744.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/59951441050.pdfIn PDF document text
    • http://signauction.net/userfiles/file/fozasopuxo.pdfIn PDF document text
    • https://atiksigorta.com/files/5988424286.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bd52dbe8e---wepojasexiviratub.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/18928102039.pdfIn PDF document text
    • https://digireg.es/upload/netogufowavuziz.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f5da92282---16892486413.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/3280969140.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/f061b49a69e9b2b99111fa2e4679738e/60476897777.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/lisedukojatapabax.pdfIn PDF document text
    • http://exosushi.com/uploads/files/wupugoludewugoji.pdfIn PDF document text
    • http://autoscuolemontagna.it/userfiles/files/28300770455.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae541bf9e3---52718229232.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_off0000e7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10916 bytes
SHA-256: ed5322e30036b32abde7c66ae049c42dc8d72ffbcfacecdf966411b3dbcb3235
font_01_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 17980 bytes
SHA-256: 27a5536b0a579652db21b8629675b19346c11e7bf9b9194387878ab17b517e1e
font_02_sfnt_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1