Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7ac7302bbd2881…

MALICIOUS

PDF

75.0 KB Created: 2021-08-27 02:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6909c25edc0f99ed6700a9eee4621773 SHA-1: 21a92baf6461b29b6902d545672ac3de956e6743 SHA-256: 8d7ac7302bbd28812a83804ef6d7205f88e715dbfb1136ed85a84d60a1118d67
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The PDF also contains a link farm pointing to multiple disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dianacb.cz/userfiles/file/voketitabu.pdf In PDF document text
    • http://nprofit.hk/userfiles/takekoweweboxirujor.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/47968624340.pdfIn PDF document text
    • http://toshiba-center.ru/uploads/files/59530109706.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/fowadumoku.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/73127316988.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7665a827e3---76458530082.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/wolelusokigegekagitar.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/c73a4afeae4e113bf2020e2f5436b9a1/2427624673.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/4c8d0a6219ca9761a90a77b1223665c2/sudefitonomomutudob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfe293b846---pixowaroxizukimor.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/reditilosazurodufaziwamel.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210504090339142.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16119aa1ef37e6---sewutimazas.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/99661775151.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/gawowowireruveb.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/227c736225e75bb83560dbc8a8bd4589/71160188604.pdfIn PDF document text
    • http://vhs1962.com/clients/b/b9/b967f936f519796c2a696a6ed1da67f9/File/pugogot.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c921fb4ad6f---femufokuf.pdfIn PDF document text
    • http://plusk-car.com/js/upload/files/95220678717.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nfm8mabgpkah5gubrvq9628ph5/81555657284.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+pounds+and+ounces+to+kilogramsPDF 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_off0000c44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 11148 bytes
SHA-256: 63d1b784de19abb8a800f10d4cb6fb249676ad3bea29c0416c6fc2bc7e8f85b1
font_02_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 15772 bytes
SHA-256: a2df7ce63024721b2a14191b941c139cb5c8270727e538f86369ba3112760415

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