Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b967cafecb3d0e…

MALICIOUS

PDF

83.5 KB Created: 2021-09-29 00:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d110ce2bd9bcafd624721d30c2b5904 SHA-1: 4287549a6e1eca368bd689b757821840f9401008 SHA-256: f3b967cafecb3d0ea8dbbdc2cea92ff9caeaec666a8aedf17826ac8553ce5cba
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites, including those hosted on WordPress upload storage. The presence of external URIs and link farm heuristics suggests an attempt to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://crewmak.ru/uplcv?utm_term=dragon+ball+z+dokkan+battle+apk+mod PDF link annotation
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/8bec4336805d4749afc283bda12e7574/30609768410.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/pelifarowojigi.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/62617963296.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161424e92a5f36---dawemidumoxotasinevomuz.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/r9di3m06d1cou2bdoos2u2f4mi/72840519400.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161330f37cb1a3---73424010042.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/islt8tvimj7ieajeesu78cne66/tovugoxof.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/6b0f3dfc4f41d40a66743e0744b38951/80412573884.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f06e4f00---54752375352.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/83800891770.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/78702723749.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/29073739799.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a17a4556cd---45610488886.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/17299443677.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea64473da---kowikozaxagopuzidilidog.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/91878751999.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/39310993882.pdfIn PDF document text
    • https://znalac.com/userfiles/file/24094576758.pdfIn PDF document text
    • https://heyratacademy.ir/file/71630906425.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b558b1e2fb---38072745748.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pawawomujazaxavaledibu.pdfIn PDF document text
    • https://basisangka.com/contents/files/75453961610.pdfIn PDF document text
    • https://sjaindonesia.com/sitefiles/file/57034866178.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210924195830_fg0o28.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/25942997510.pdfIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3AF 20964 bytes
SHA-256: a84ea7f5ed8bdcbafc022850c2f394c1ddb37751dc717f4c6af18ade911e96ce
font_01_sfnt_off0000f98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98C 10768 bytes
SHA-256: 97522985863234a341b298c87dca6605157bb7a32340993df5991c0da62a2a15
font_02_sfnt_off000111e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000129f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F8 16188 bytes
SHA-256: 800554d3d6320da9c8ab21a3ad3d270f40e7a92360d7538c059d647d952d1d34

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