Malicious PDF — malware analysis report

Static analysis result for SHA-256 6867428eefd93bde…

MALICIOUS

PDF

70.2 KB Created: 2021-09-26 23:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7beb461c7e7d939ab6eb30a045e06284 SHA-1: 342803b7e3c2db66c5bf30a8c4ca3c2a1194d5e0 SHA-256: 6867428eefd93bde2c642c6997aefa659ab4ff3dc5b96a45d760997e2fc2a92d
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with multiple URLs pointing to potentially compromised websites, including one hosted on a compromised WordPress upload directory. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/bidawazabimoriwuzubuxi.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/cg74ek457s21l9cuenl1o2m2jf/89561765452.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c10fc4babe---nalalobifafagatelag.pdfIn PDF document text
    • https://10playsolutions.com/clients/softklk/documents/_articles_/file/tejarilafudojiluneb.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/36726244906.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/femakesenodipapobev.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7bb6919b849e8616928e55a9f5598213/sunonuxanuwaduruwig.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/jugamogogoguxexobugejo.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/99569698306.pdfIn PDF document text
    • http://lovesenergy.nl/file/ravifedaloxoluxagisoma.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ecb9ec8c---zomarajulasanogodiru.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/13508337764.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/44931118260.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/20607370310.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/lujevafonutawewum.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/puviparodotasekozudujit.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/nogonorimuzejanenelot.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/7757991081.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/12800553799.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/41147894000.pdfIn PDF document text
    • http://brenderup.ro/mm/file/jegimiliposonotun.pdfIn PDF document text
    • http://baove24h.org/upload/files/mubeputasibod.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/fijafirobituk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=vumoo+movies+no+sign+upPDF 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_off0000b019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB019 17236 bytes
SHA-256: 879c891f7c073eeb32a713128f8fe8d7cf21568a899d4c1f6422cddbb8d670c6
font_01_sfnt_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44C 10324 bytes
SHA-256: 0956ca70ec73f46297c05d1658c26148ad0b932e92f185c4f520fa4cbdde0323

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