Malicious PDF — malware analysis report

Static analysis result for SHA-256 17bf0b882cefdd78…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 17:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9ae4c4966ce4c46805366cc74b859392 SHA-1: 6fcd12e7e0ad0aa09eeb3f21bdd3c544dc346726 SHA-256: 17bf0b882cefdd78bf2710992f9f01b595bd32f2517d279928da0ec18e32e3bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://pixomot.ru/uplcv?utm_term=ncp+for+emphysema PDF link annotation
    • http://qlinairnv.be/userfiles/file/66215276227.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/11327883980.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/67726525057.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/63239643585.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f3d2552a3e8dc38b6e5cfbe3081496c9/86052253665.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/72479287829.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/narawadejawo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b1a479a45---bonefuxuxu.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/6a249e8978ec32c62f80a6c7d1a4dd5f/75521282695.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/16695429539.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608db3c815040---vusuriw.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/57718794620.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5ef67bc179f029ebc396fc6e2ade4395/wegogapuko.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/65591550703.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b3535bfca---vabifes.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160776c6af3c21---60392752426.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2bec75576---7434040609.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/70331295114.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/27e5e39200030147c5dbe40065ae3151/malapew.pdfIn PDF document text
    • http://air-ned.com/uploads/files/gorajigadowixod.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/d5958ce2c2c45e8963e129ef6acbeb1c/xugijomunagosopeloxeruve.pdfIn PDF document text
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/48668258841.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/35432b37de0d8c9d3d16cfaad25d738a/zizesuxugip.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/83712504849.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/7latu192n62jror136gef4jrlu/naloporovalexogazexino.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bcea943a5e23e6e29f00a2918374c3ff/34582226451.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_off0000e0cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CD 10496 bytes
SHA-256: 9054e5e0af2dc92b2631310138360356be8925b79efc08ae1ab0ad5ae324a5cb
font_01_sfnt_off0000f8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 16756 bytes
SHA-256: c86e8df33366276984f371f86db9de14576e5e5ba17d9bb1e362a302e0bd18fc
font_02_sfnt_off000123ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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