Malicious PDF — malware analysis report

Static analysis result for SHA-256 569e4a3920233ae6…

MALICIOUS

PDF

80.3 KB Created: 2021-08-08 08:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a94bb47d501e4a2add106ebaaac46cf5 SHA-1: c40b0ccc04d3ef9e376d7fb737ed01dc4ce5109a SHA-256: 569e4a3920233ae6e4bd0726ecba27d7921b9d37b07b5098fdef1145f6ca0433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many of which point to websites hosted on compromised Content Management Systems (CMS) or disposable hosting. This suggests the PDF is designed to act as a link farm, potentially leading users to phishing sites or malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dbexpertise.fr/catalogue_dynamique/file/7353685045.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100e96886d7c---gafedak.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41d8aaa3b---lajogufan.pdf
    • http://umrllc.com/userfiles/files/98066479562.pdf
    • https://locoffice.ru/userfiles/file/jebitawugeta.pdf
    • https://noithatkuongthinh.com/uploads/files/85279950285.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e85b3324ee7---8261283149.pdf
    • http://akademibt.com/resimler/files/27724484201.pdf
    • http://orkoien.com/userfiles/files/74389839255.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fc8f4a3114c01d078a09900d12f12123/xoronutupunanibapafajinuk.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/5fef678da10a7e3228a793c08c4335f4/fuguvuwukekajejukowuvob.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc9be5994---78378451736.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/qkbjbolbsj2g55dp5p17cg23ql/24313504086.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc487e8dd4f---1081447957.pdf
    • http://whuntex.info/userfiles/file/kisipazorevajopatazi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729be6d244d---81569146393.pdf
    • http://td-mg.ru/uploads/files/numetositexutuvezodag.pdf
    • http://lohs69.com/clients/82366/File/gawazije.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc40fa00cc---6298558581.pdf
    • http://heryeryesil.com/resimlerfiles/tarixowenozoxom.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e4eda433f0---juselesisufunirano.pdf
    • http://soldearenales.com/galeria/files/65209010256.pdf
    • http://www.hgbehringer.de/img/files/files/84261304348.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed2090d67---83072524751.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=gramatica+del+uso+del+espanol+nuevo+edici%C3%B3n+%28a1+-+b2%29+pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8f.bin
f4d94733e8755a1a14b66c9efb878460a0f1461e58cec3907fc087d9b680bbc0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 18812 bytes
font_01_sfnt_off0000fcce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCE 16792 bytes
font_02_sfnt_off000114e5.bin
be0dba6a3502a49ffe95280304d112088a990183b5e967cb6cbcc9ff75f63391
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E5 11628 bytes