Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ef72f8b4c03513…

MALICIOUS

PDF

89.7 KB Created: 2021-07-17 03:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: fb4043185e46507a196c25d22489e232 SHA-1: 1ef198606f4c3bc2191ef16e6aba343b97a5363e SHA-256: 40ef72f8b4c035132d3bc7483bafbe95772b21d533d719862b14639129cb9acb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://moveo-sport.pl/userfiles/file/46601306710.pdf In PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/vudaxuzasanupuziwe.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c7cf7a44b78c1615684d19f5ffe81ffc/32454649496.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/kulabuzapap.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/71974676234.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/17492195941.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8dc8f16904---75946674037.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/656b8b64bc6fe83a9d77615fc527942e/5652327116.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/85728344866.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/7583438988.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/sidonefotirepel.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a037acaa1d6---26595961241.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d2c4df930---kefomito.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/32c21a2f82361230569989a738f0e916/2377650850.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160941f759578d---xabadipotuxariwusixe.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v8pi3pqmdhs2qchnr2hg38nv6s/29316060269.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/40158909406.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607563d3e4e64---80712531813.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/baluzeviduwufexavawazujof.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1728b8e556776b8c3d1c9bb6039b98b1/47199845101.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/22027520597.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/79122579524.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/wojusosirumudujimutar.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/91144770940.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=teachers+day+quotes+from+biblePDF 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_off0000fc03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC03 11100 bytes
SHA-256: 449bcac08cfe5cfa9c0c7958ffe5b85b3ce738746aed393ae89fbefdae0df728
font_01_sfnt_off000115bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BC 17184 bytes
SHA-256: 7878c5878615fe76ca598be5d68906ed64cbf3b83425335bf7b0daa4dec7b0f7
font_02_sfnt_off00014262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14262 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1