Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2a6d65e920b8537…

MALICIOUS

PDF

83.8 KB Created: 2021-09-06 03:00:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a82e76d3b3e85ad94855a6205bb7c44e SHA-1: 8f86119db8bf826c05e1614a9a61bf2912e5b914 SHA-256: f2a6d65e920b853717f5f823ca194449bee00d034df72e8a7dd326fff3a8ceaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1fbafdcddfbb3fd706f44c34597b0b11/24551345167.pdf In PDF document text
    • http://jjmcp.jp/userfiles/Image/file/70443195222.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/54185694470.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rakirimeseleduzusoxuxuga.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/zeposasaburulazuxuloz.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/e6231bc38303863bd59d864cb06e9629/pafavojif.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/20299685575.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbf6e8ce37031816bb5b891a1101c367/65772304627.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a829483d---40945381417.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/21581782261.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/zikoninuxopugusifulaf.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/546da1e6f76a061554e8fba76c21c2bf/wuxuwuwuwetutijetosanedu.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8f395252---surewisuwomiruredaseleda.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794151bff6c---95307228975.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/jeletadudugemefe.pdfIn PDF document text
    • https://aksusu.com/upload/files/1563831174.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/puzidix.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/35432753677.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/27854047841.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/99788098256.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/24639457931.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822dff5330f---juvezinesivixorejaj.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/a78f962e6cd0494a15701eba08ec0a91/watomuxi.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/firarotorutujeboxobul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=science+exemplar+class+9+solutions+pdfPDF 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_off0000dd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 19132 bytes
SHA-256: e1e16e07a8e2d59232f0d0ad167439198a3fc1cfbec19baba6a20f8ffb64bb0b
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 11228 bytes
SHA-256: 674fc08cb65ee039519e620d7974e1e579f760fc205e8fa46c83066a7e6aaea6

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