Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6dd176d9946a483…

MALICIOUS

PDF

88.5 KB Created: 2021-09-03 10:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e8da4841531372aa30651c6357ff5402 SHA-1: a8dc6d1e37542bfc946e6cf4dcfca43830b1c4fd SHA-256: c6dd176d9946a4832e610d4250a395802b68317f29dfb698e77b63b200bc234f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://huntic.ru/uplcv?utm_term=didache+youth+2018+pdf PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/tkqmvkfgcq3e7c2bimmctdj5j1/rudirabutuvisir.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/90925858520.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/segad.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6irv3uvn6b46fkte4iffvo58v9/93131059036.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/xexebolinirudopibosu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160be74927d277---seles.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cda415ab5c07eccc7f51e2d4c92021fb/kexemulegidipivutinazuf.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/vnbedejb6bckuvbelpqbbpjqnh/71262853918.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/29631324880.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2caba7be6---temenuxotidused.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/10500136161.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/c1s36sv2ju1bvlr3i4355o72rp/vafurojin.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/569cb19a943aaa2d46d2549101cead4d/xuzedademowejetiwobip.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/xapasorefepafa.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c45b8c7b8a5---94519292141.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/ggfndva2089o31cdb96fhu8bv5/82809789941.pdfIn PDF document text
    • http://hkalc.com/userfiles/60545001192.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/16974662ef5d84a686601f4baa939834/pexon.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5958b7cc8f---fimonopubelomi.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/taxopitijosimezijawunalan.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/xolutowudojizilinogo.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/juvumutarezut.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb77a3e783---65920599926.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/bopiwofebitisinuvoxasikal.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/62148285567.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/julededagajozovumepu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 11016 bytes
SHA-256: 1e594d6ab19a6a98a0f5e3cc9a2955a3fcf1a9b8099775193c0bb945d7e93229
font_01_sfnt_off0001043c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043C 21188 bytes
SHA-256: e06375acbffc8800e6ae3d6727ab87b1fabc0ea426eb8996c9d72b0b3ec7f1a6
font_02_sfnt_off00013b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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