Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aeb382eca531a6…

MALICIOUS

PDF

78.1 KB Created: 2021-05-27 17:32:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 38e2aa49ed0026690eccb036bad740a7 SHA-1: 798284669ac9a8dbc025ce42affb635f3d665c36 SHA-256: 76aeb382eca531a67e27d629d8aa7948e580789cff622fe1af9f0384cdb8f770
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://oniceh.ru/uplcv?utm_term=cb+says+antenna+warning PDF link annotation
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/be74eefcb92dc38347d2a2ed7be4c138/nufepulu.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160855058177ba---23846233087.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b45f8b60f0---85201394208.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8ff43e2d6---11938164124.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f183e0e55e---nobubamepik.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/e0ed66ad0263cedb0bdf9c7c7a0d697e/tigazotafixemifi.pdfIn PDF document text
    • http://aps-mes.com/files/file/rukutigisomixikuluwewino.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/4624e67b0ad018ad28faf200c4af66a3/lifalir.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160884f3b7b966---59052357479.pdfIn PDF document text
    • https://brickbodysupplements.com/newerac2c/userfiles/file/38299251644.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/52816114324.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c8rjvl0bd0tdj4b34q4dqiekq/radugasaj.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/a8256e042deac92162a5807f718fda04/91666378545.pdfIn PDF document text
    • https://energooptima.hu/upload/File/dilogijowakajobeburip.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a86aa5d487c---90666785467.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/bafewomunafupo.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ad71f87afc2---waropanopapufatej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE190 5624 bytes
SHA-256: 0f190132db18ce9e344b14153303a053e78f21ee21965fcd05d7eca067c42097
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 5060 bytes
SHA-256: cb1169fc70c94a68ff18337086b2aa3db3c4cf8e75a16a6996c194f0140e4645
font_02_sfnt_off00010654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 10240 bytes
SHA-256: 7d0c9f083d899be0f7994570ac6bfb9fce3abb1ca43012eb6688e7702da1b791