Malicious PDF — malware analysis report

Static analysis result for SHA-256 75038aa817bfe492…

MALICIOUS

PDF

82.1 KB Created: 2021-08-23 10:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f5f38e37bd33c8f58c02e3fc52de7971 SHA-1: 53729778e9407772f5f1d7edd8965898eaf257e2 SHA-256: 75038aa817bfe49254f3bf9a596e9e23ece6dc0898e49d8e3b25bed705daf6f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious PDFs that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=a+primer+for+the+mathematics+of+financial+engineering+pdf PDF link annotation
    • https://cabsfromheathrow.com/userfiles/file/fenujosazuw.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd4547f9d9---lexukibibavapewazede.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cda26b03c9---32781447164.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/popebopiletagelajoxux.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7415d37cb---niluzeguvaworepibejejaj.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/mopelukemejijisisim.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/50821051941.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/167638693.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/mevotujaragujasu.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/79285574582.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/luluxi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608084351b38f---nekegojoxosusififiruk.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/xumowigumubos.pdfIn PDF document text
    • http://rnralpha.cz/res/file/saxar.pdfIn PDF document text
    • https://puppometalli.eu/file/bovimiwate.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/84886106106.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/22140708105.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/76371641947.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c0479c03051---50634044943.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/17mi1pkfs0otmue2k6iiku7p9o/48432514026.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0b09b5c97b1ff822dd24a8ace3ffe9ae/kilaliw.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/74372041523.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_off0000da76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA76 17584 bytes
SHA-256: 6ce0cae7e3c3d775e0efb36b3c48a886b16335650f88366cac8be64cb7ba6ced
font_01_sfnt_off000108d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EB 11048 bytes
SHA-256: 7544e4341892eff9cfdd456245a89fc088990f4fb119dfb2c3cb55bd9ea4b5f8

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