Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a7f52cf2080989…

MALICIOUS

PDF

129.3 KB Created: 2021-09-06 07:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 092300411a303e190f22c20ddc4a43c3 SHA-1: 9d23931bc7aaa7e469165793ee338309ab0e4abd SHA-256: 20a7f52cf2080989e5ff250d18f96e07fb2f0f5e2646a05cdde241ac8ec2a1ee
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and a link farm heuristic points towards an attempt to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://beiks.info/public/file/xapaje.pdf In PDF document text
    • http://benrassam.com/uploads/files/jewudajulefakabenelaw.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/xozixawitaluxevalobudava.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/sepadorifu.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3lq4jfr9m0lvbdcmivripcekoi/81596360233.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/32267617332.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///botafuwutukawibiresad.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96c837ab690f4ced15b1edd743ece3c3/bilaterisakubuvewo.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/92330357209.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610587d44d4eb---40013271094.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/wadowu.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7b86682b2---88183835226.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/badora.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/d9039659952daaaadb3ae1ef148bac03/84220987619.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/pn5pode1803e7eadvtfgob1a2u/18287551009.pdfIn PDF document text
    • https://31app.com/userfiles/file/56366304773.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6076c1960febab75881419bc334b2438/87173827533.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/fuxemedu.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/xonovisunuzomuputiti.pdfIn PDF document text
    • http://magrubber.com/images_upload/files/60542537451.pdfIn PDF document text
    • http://olech-rzeszow.pl/userfiles/file/32357227859.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac91eed3f---89124293276.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d77e79661---sovigixerematubovofabo.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/44268333815.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/fagefebaxutonozeve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=contagion+movie+review+worksheetPDF link annotation
    • 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_off000194a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194A7 10784 bytes
SHA-256: 82ab7b98d268e38bd2e3769167e503cf3a1c6e38768d2fad4eff53e86329eb5b
font_01_sfnt_off0001ad72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD72 19212 bytes
SHA-256: a73fdc40579cdccc9f90235334b2f4ce6842880ae4ffbe38736277f5ea4c1320
font_02_sfnt_off0001df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1