Malicious PDF — malware analysis report

Static analysis result for SHA-256 0601ca64c0d23285…

MALICIOUS

PDF

72.3 KB Created: 2021-06-13 00:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa3ff1a197a83f2f80f32519ddd8de5c SHA-1: 07b75d44370a09bb0ea3e9607e81f5f7376b39e6 SHA-256: 0601ca64c0d23285d65325c781141f544af75e342d07700277d605399f1c5181
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that point to compromised WordPress sites and potentially disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://infrive.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+mugen
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/ed867a79c5e04a794d06616a02ff56e9/84598454313.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/rfvmu38hbls9s0fks63sfirbrn/sopebililawofevar.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afb3d565b8e---83067124981.pdf
    • https://acgroupenterprise.com/userfiles/file/regarebe.pdf
    • http://medicare-darmstadt.de/bilder/UserImages/file/bupatojapubipifizewinob.pdf
    • http://meble-tk.pl/userfiles/file/89260924300.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef97900fb6---33565010717.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/455f2uu7t7ng5l4rj5vkb1fvtk/bazowazexa.pdf
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084131a6256b---95945209041.pdf
    • http://ahxxzx.com/userfiles/202106/file/94465980150.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec7036c381---27408121496.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e34ec8728fd6220640da66ea540dbf7e/viwitalazifuxetenoj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0fa.bin
cd4388e83ee2e8073362af5c2a977d4f2cbca5219cafbff238e7908583c07a16		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FA 5048 bytes
font_01_sfnt_off0000f217.bin
6f5c514b2d874cff5b93c0814ff926253dbe33d44a705762c8ba2f06a4295b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10224 bytes

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