Malicious PDF — malware analysis report

Static analysis result for SHA-256 12400e3941f6db07…

MALICIOUS

PDF

97.1 KB Created: 2021-08-14 08:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 452b0e910b553307e853e2ded237323f SHA-1: eb25095dd99054173ace2abc10ce37d75a9fb112 SHA-256: 12400e3941f6db0776218335e633f3dcbfa54651fc588868bb9421715716bc68
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm or phishing lure. The presence of multiple external URIs and link farm heuristics strongly indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=recursos+humanos+idalberto+chiavenato+pdf+gr%C3%A1tis PDF link annotation
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93df53429---42029912808.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/85f1525f062b192b69ab087516f0c5f7/kaginebavotiguf.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89404a8e2---25319173863.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u8nbh79o14ta987cdo7to9jbub/sejeviju.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/89874415266.pdfIn PDF document text
    • https://phuquiland.com/upload/files/wadopuvojuzudoz.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/86973281531.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c1e8364ceb---64576358130.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/65164880745.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/26518009425.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/2c9fc7daf9710225f49ffc061dddffe4/lumifoxig.pdfIn PDF document text
    • https://caffedisanto.it/file/nomubar.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/gixaxarewavevel.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/woremibolufen.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/b01bb4439b127e66821fca30c968d456/50953966424.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/1ac2d95059bb1840ec7aae1beb45b178/24173421344.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/79646cb30751d5c7b331afd4e50764bd/vofabokavomibuwilap.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff765f5e4---94697945913.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e200b5c249---wadejelulufujewexuku.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/melax.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16094be0388b92---61905342049.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/vimikazipusulararufi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b353e08d166---megegibumixofidapiweli.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/93143156740.pdfIn PDF document text
    • http://mylodge-naoshima.com/18102681977.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_off00010f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F54 20916 bytes
SHA-256: 9e8e6bf85fde98e98000f0c74ff7a8bf1f728685f38f5ef48a0b0161ad32876c
font_01_sfnt_off00014160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15977 11596 bytes
SHA-256: 52942b26e4ce6d32eb37ab7b7fbad1d458508f021b68f023678d42437cb7e09e

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