Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fe0a5f2f5c871a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-15 19:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b38e49754dcb12495b7c40699f6a39a8 SHA-1: 0095fb15eafebe243f2a69e60ad43ecbe649634a SHA-256: b9fe0a5f2f5c871a2ab6198a7a8c9f13cd958d7e04a7d4ae5f7b7cc12dabba6d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users into interacting with malicious links. The document contains numerous external URIs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content or exploit kits. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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=free+download+attack+on+titan+apk PDF link annotation
    • http://metall-press.ru/files/48164087436.pdfIn PDF document text
    • http://softtox.pl/new/userfiles/file/49306117589.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/jotepegigudemezasiniwof.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f4db9c102---33966759066.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/ganorabudoxaf.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/30601883135.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/81189277122.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5pui6vnn1c0tf5okua4tnt2f72/80147821464.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/22283406056.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/91428653050.pdfIn PDF document text
    • https://2acontractor.it/images/file/20632441524.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/jitodidovofimivonasomegod.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/lifujugagugivek.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/namoromolidagom.pdfIn PDF document text
    • https://membermimpi.com/contents/files/jopewivatubavewopese.pdfIn PDF document text
    • https://inks.bg/userfiles/file/20115453119.pdfIn PDF document text
    • https://nyirfa.hu/uploads/files/79763517378.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5fpv7fhqel4k5kin7mordhq143/36322775556.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/korinoxutabolitalog.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/18238388395.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/wabamagijaxikijoluxogado.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da752108b3---makagegazakatix.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_off0000dd13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF525 17760 bytes
SHA-256: a764711dd113592047876c63633a900b603d55ab520131888a7bf30ac5d92122
font_02_sfnt_off0001235c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235C 10496 bytes
SHA-256: 59e4f8dbac7d6183a222963ad6d47f35ba9594a8b81091fd5a58070327b0296b

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