Malicious PDF — malware analysis report

Static analysis result for SHA-256 46db945f5a7d4238…

MALICIOUS

PDF

78.3 KB Created: 2021-09-05 03:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b3de2bfcd0eea98745a8a4a68ebac23e SHA-1: 6a7d2c7f62cd109c1dcd9721415d22a0289c0089 SHA-256: 46db945f5a7d42385e3a41010c6f0ad98b228f264c1132309be7772f30222c23
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised WordPress sites and other disposable hosting. Heuristics indicate it functions as a link farm, with a high ML score and ClamAV detection confirming malicious intent. The primary goal appears to be redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f70e0fe09fcc5102e0dc284b7f56ce4d/xokafozopapawozofawosaza.pdf In PDF document text
    • http://studiogaleazzo.eu/userfiles/files/19880406378.pdfIn PDF document text
    • http://theettiaresottawa.org/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/25958109484.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722c1826a69---jidobutafenof.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b3aeb3cc7---78590855055.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/16593303365.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2497798361.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210808_5DE827817D168EC2.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f97ac4db393ab7a27ce46a77eb2bdead/43939418577.pdfIn PDF document text
    • http://creationart.hu/files/file/fejufixowuparika.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/65872231411.pdfIn PDF document text
    • http://cssh.es/img/file/34163521507.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/rijebolememokaxi.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/4ffdc744874c74bdc3df40d083111717/tugegupusipe.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/50f80d73263326dac0f6945254d06668/sepunuju.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/42851062573.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/xuroz.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88c029eed8---64138697216.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6b80e587d---giderupawo.pdfIn PDF document text
    • https://blugarden.eu/file/75829083532.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/zejivokezijujabomi.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160704f6aa53a7---zuvuxejedexevezemo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/mupekeg.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/49685247342.pdfIn PDF document text
    • http://rsst77.ru/upload/files/dewirizeriboroma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=capsicum+annuum+l+pdfPDF 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_off0000ccf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 10464 bytes
SHA-256: 626b91a90814501058e6b9d061015c53ba57f244b06ad18aab5f81b765a837bd
font_02_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 18256 bytes
SHA-256: 49f0efd4bce5be6128af8568bbe74cb4c9e8c80c224d8ae9b99a2c1125b13f5d