Malicious PDF — malware analysis report

Static analysis result for SHA-256 3670a9bebbe2469a…

MALICIOUS

PDF

77.2 KB Created: 2021-07-17 03:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5578e2948e4a77df11225a270c453b0b SHA-1: 33a5fd7b74c624bf4fb8dac780040e43f1d8b1dc SHA-256: 3670a9bebbe2469aaa4a760ac867e57fa2961e793b333d2a5ffe9adf6c6a01b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the ultimate destination or leverage vulnerable infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9a53d8e3f---45600295076.pdf In PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/bivopemimajotibijoma.pdfIn PDF document text
    • https://slaterlighting.com/wp-content/plugins/super-forms/uploads/php/files/c0fa9f0b0685185d368886d9b9f02cdc/88587602739.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/figawi.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4510e5afb---bokizagerep.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/tezabijotetix.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9675791a69---sufof.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/38961925421.pdfIn PDF document text
    • https://digicpictures.com/downloads/85685561025.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4996078d75b524db992d42f0aca67e91/84890599998.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/41824741339.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/vomivevepetunaxuf.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/tebepifaxalokobenovaw.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9e9ggfpjucguf24mhlu72tvlr2/49064256831.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/47550828776.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082df0e14a9c---mojilamurotukovarodewoxo.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c71c1b8bb9---95167120770.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ae9da0e8478d80588c3210c0f552fbc7/11087341470.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/56480492484.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/muremapejuduzuposifi.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/49195094593.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/talejopifovilukilosinovuv.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/pefitokevujelowunawaluda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=circumference+of+cubePDF 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_off0000ce4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4D 10292 bytes
SHA-256: 2254f017831386032e4442e6369299e6d7ab2eb60e224b0918c8f95bea3b9cea
font_01_sfnt_off0000e56d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56D 16388 bytes
SHA-256: 6c4e7fdbdcdf163c8bc4c6de27a2f0fb5c9b101b8fee3f31e5c4b8f2db678a77
font_02_sfnt_off00010f9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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