Malicious PDF — malware analysis report

Static analysis result for SHA-256 03a0d07cdb7cfe39…

MALICIOUS

PDF

98.2 KB Created: 2021-09-02 10:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dfe02ed5dab975822e8e593b0ccd719a SHA-1: 5b59f77ef2561b4da1dc9d01e59fb263401e68ae SHA-256: 03a0d07cdb7cfe394fab9a5cbe346b021f98997ceeb123e71daa38b56ba4cb16
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 compromised CMS upload directories or disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://positiveforce.in/uploads/files/biwedobematufu.pdf In PDF document text
    • http://musikpark-live.de/userfiles/file/nalagifipeka.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/jotulalezuronoxade.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781502222d1---83171002801.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/towanug.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/0fljrfsflkg5iqejslmq3nm239/86529871762.pdfIn PDF document text
    • http://recrute.fr/files/files/suzusasolifu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/81520656037.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b99fa0154b5---53680398411.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae002f1a009---dopesir.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f12623ef8---rizitataxedevew.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/d580b8b9f5408b6c48833b753bb6539b/19468397361.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/seguruxuvipokorumeg.pdfIn PDF document text
    • http://universalthailand.com/images/uploads/ckfinder/files/73019826552.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/30488240280.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/39056315311.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/60122131401.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64832d34be---88415706593.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/04a706d0771e8defd8465f88ec530daf/mirumadikijuropiludes.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/88913971277.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/78290835409.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/6e08c4acb37fec2e77337b34c64ece9f/46978827089.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/4cfd90afedbbc5bdf56d6af61474580b/42414028503.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/92086423556.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e8eb5e62537---siziwurojadipabigowij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=drawing+reaching+handsPDF link annotation
    • 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_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 17660 bytes
SHA-256: 1ccaa82ac3c85a5411ab11ef30be20568525fe0bb20d24ae68ab4d352972a0a4
font_01_sfnt_off00014b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B81 10472 bytes
SHA-256: cb2900b6d6e56010a067359161c7ceb312ea62d0793aa4f86547bdcfe37d900e
font_02_sfnt_off00016312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1