Malicious PDF — malware analysis report

Static analysis result for SHA-256 39f1784a512f9065…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 01:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c12abe91daaf8e16c87898bd991468eb SHA-1: be5505d159f5b2aaf76ae09ff4470412d5918086 SHA-256: 39f1784a512f90656bc4ee799ec908c499c708f920c296f53814baf1bded917f
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/3b8b3f51442fc107d42f695eee79e0ee/85026769311.pdf In PDF document text
    • https://resicolor.com/upload/files/11124393501.pdfIn PDF document text
    • http://pmke.cz/pictures/files/62648420989.pdfIn PDF document text
    • http://kccmaul.com/files/files/vuvetatarabowugudoja.pdfIn PDF document text
    • http://thenext.pk/userfiles/files/20145915978.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/dasopirigob.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/30981995926.pdfIn PDF document text
    • http://myesen.life/userfiles/file/82720975217.pdfIn PDF document text
    • https://skl.deindrukdemo.nl/upload/files/vurixegalawabelelopujevis.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/70804825267.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15186324309.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/35872913566.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/guzawolelunizevaki.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/51392701908.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wuresepixadixux.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/zosojawurozeboma.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/benojapuxomoxoxuxakor.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/dvpe6qv8qthdrn9f2b7hhrsjeb/34563078396.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613826d88961d---52756605017.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/21880729663.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/45842328144.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/kanajakaputawewil.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/943c53f5743691c68a518f92b8df9800/59893128122.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352cc885eb9---dakiwoze.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///dofenujavosexatamiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=sending+video+from+iphone+to+androidPDF 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_off0000dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5B 17764 bytes
SHA-256: f27227ce47f38b1f67104deb06405954bec250eed227cec634f367479d886fce
font_01_sfnt_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 10872 bytes
SHA-256: 126f741bcd4849777d89e3aa506c171c24612e8d557e6ea2f97d1ca9c08c37cd