Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8fe604668148ba…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 02:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e22558327bbde9b34f338b27b1e69c37 SHA-1: aaf83e6674ec999eaa2edc4c735a07a46e810ddd SHA-256: 1b8fe604668148bae8d85cf474b16bfda61e195b43f681e5cf98512024a7c3f0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. These URLs likely serve as a link farm to direct users to phishing pages or download further malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://archism.ru/uplcv?utm_term=gina+asma+2019+espa%C3%B1ol+pdf PDF link annotation
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5173b7d0e4---72008616972.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160763ef389c78---mopijobujisivejaweni.pdfIn PDF document text
    • https://airshow-bg.com/file/nobawogulawadufedetepupa.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a907385eb5d---vuvojo.pdfIn PDF document text
    • http://htwy.com/upload/file/20623929836.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/52352089897.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/wajikadonetogod.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/48924518079.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/rubivixomatinek.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/68355792438.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160d696e23f854---28457900405.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/1b191107026c44929f4026e7636fe7c2/tiwodamokitorutox.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0cdc764376---4936309185.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16126b5d8287d7---dexozinigaxafokiw.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee97e5dbdc8---zezilikeduverowez.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/bamovogarubama.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/31527471827.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3fb02d78c5dd11ab28fd871c7634961e/28859269654.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/puwilexonowido.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610b00cb8b0d4---biborenib.pdfIn PDF document text
    • http://nfc.soo.jp/file/tomotoxabo.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2ecb938529f6a8cc98c4f512a2e0a5a/23851563858.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/57948981500.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/darodowujebaxe.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/2cfbd5851b7470c423c48e9c9a2a7db9/27582400129.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_off0000d960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD960 11168 bytes
SHA-256: d7d4571851bd5eb04d4e50bc5d70b60cd7efbe736fc55ece238fb1f6a082f38e
font_01_sfnt_off0000f335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF335 20340 bytes
SHA-256: 9050c2134113747a9eaa06e166e0f2a98eb6b58f024e5fc802d9dc1c7955b30c
font_02_sfnt_off0001260c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1260C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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