Malicious PDF — malware analysis report

Static analysis result for SHA-256 a73792cac9dfbcea…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 11:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6809c69130d2bf273c660b60b3806a35 SHA-1: 10b386fac1d345c7984e25f73fd0cc6d3159d3b0 SHA-256: a73792cac9dfbcea31ddfa0f8adbb9c59c09ab4f148dbbe319ea8daa9236826a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to malicious content, likely for phishing or malware distribution, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/eb1c2c08e501aa53207cedf8d20a15f4/13473626920.pdf In PDF document text
    • https://kham.vn/userfiles/file/gudanakekozirazupoba.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/208cd98406997220f6690df66da59e0e/biwefaxadazebodawifuk.pdfIn PDF document text
    • https://ags-car.com/upload/files/36174573072.pdfIn PDF document text
    • http://pronobile.de/catalog/file/danavawivibewi.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210617_6B1ED9906248341B.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210522090026.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6558e7bedb---88609628330.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/liwoxegakitotojunojopaj.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/jigetaselatonudetujaxile.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/7ljbn8m1t8rh5lllsuke05dau4/jolabawikop.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/23fa0343d33db644bf09bdb14d6c9ecd/49802364536.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/degewemexoneb.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/mavulemojurosusef.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ca3848cf---wepopisu.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/26551087724.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/xatejogafim.pdfIn PDF document text
    • http://voxel-avocats.fr/uploads/file/47281069277.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/jaxibameku.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/22919653691.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/rakumaporaxi.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/51718173763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=decimal+percent+to+fraction+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_off0000cf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF5D 10924 bytes
SHA-256: 3e109e706af0762f6a252f0d4deb484887a6498f9ce7620d288d275aa7628a63
font_01_sfnt_off0000e88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001009c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009C 18320 bytes
SHA-256: 99a710a6eaf785cadf4fc5097b967b10d25d32d00d7e1cf5f3e3b8457086cc7d

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