Malicious PDF — malware analysis report

Static analysis result for SHA-256 80159f451a24a47b…

MALICIOUS

PDF

107.1 KB Created: 2021-08-26 14:17:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 023aa58b49f55de64383faf9d4e20b0d SHA-1: 81e393fe78123227a6ded1bec2b5f0f3e8d3a254 SHA-256: 80159f451a24a47be33efbded457979cef37809670999ab6e0a031a28e545acc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised websites, many of which are WordPress installations hosting PDF files. The embedded URLs suggest a phishing or malware distribution scheme, likely attempting to trick users into downloading further malicious content or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://drafthe.ru/uplcv?utm_term=great+books+of+the+western+world+pdf+download PDF link annotation
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/fd281bdf8faef0e66ca8028ef34632a9/61892912805.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90f07c185f---lixinemodu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d2356b358---lafokizozetukofexepaburuk.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/kixexuzopupejamerosuje.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f954d0b---lamevitewukuxezaneroxafu.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63f639d6b8---vemonofolaxilujo.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a3baa8a71---birolukugov.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/mebes.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/l11svdvngpqvpflkjvefq4bf8g/lizalesudo.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/falewomerena.pdfIn PDF document text
    • http://kredoteka.ru/uploads/file/67864321126.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6f08e9e87b60a1be5fe5d4590ad99db3/32340218819.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/nazizudimesisatil.pdfIn PDF document text
    • http://uss100.com/clients/5/56/562308f4da1da23328cfd9e5c9f3e68f/File/tetevisopifegudo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/5b1a1ac99f87744e77df437eaad8564f/4652491603.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/81j5vncqn5rcg3hsnvmbatkvpo/novunuzexateverejibufon.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1eb0d9344---dunevif.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/89252607899.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/el8hs59h8idb3vin54k55se6ut/40777260090.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaa957e17f---2939599036.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/91682563748.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/bomumotozizikedoj.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_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000158ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158AC 17808 bytes
SHA-256: f3a02bfc42d3d2d67328929518e03e93e57c71925b11e645d718de1bee46c728
font_02_sfnt_off00018570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18570 10860 bytes
SHA-256: 94ac93430eeb189bdee4ea1763f66ad9fb103e8b457392d91bc580939978a2a4

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