Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2843e77b939ae88…

MALICIOUS

PDF

84.7 KB Created: 2021-09-22 16:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 02c57c26495ed86f788a5f9bb1c0799a SHA-1: c1a2d39fc04edd60a8fd30b6cfa1d8c3ad8256cb SHA-256: b2843e77b939ae88e5950a8a667c6b5e8470e700c4bfbf6c5cdb112d318d8620
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. While no scripts were explicitly extracted, the PDF structure itself likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://lube-stc.com/ckfinder/userfiles/files/63763155813.pdf In PDF document text
    • http://wsp.pl/userfiles/file/gowawoluwexijixifin.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/luwonixikome.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/zitalupilimetidore.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/to4l4bqvmud5m44qhjgh341mcp/zoxomovegavalamajixipe.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/40693801487.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/81835740684.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/wujofezipapowoxapaja.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/db0c00773a1f31bd3c7b19ca895affdb/duzese.pdfIn PDF document text
    • http://aa-nusd.jp/95036305464.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/non46us7aknb4v34pt664a0cp2/zovudasuxawesir.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wodiwiwovakudatul.pdfIn PDF document text
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/44806508173.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135df6e002ac---84146293366.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/91518809012.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/16952471212.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/funadapobo.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/mimarida.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/muxebasates.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/2696973336.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/13919831268.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/51104213799.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210917182227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=run+games+on+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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 17472 bytes
SHA-256: 64d0588d8f8b58e902afb69a896517888bfb63bbf9c48ea5fdaa7630ae82aaf3
font_01_sfnt_off00011510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D27 10592 bytes
SHA-256: 41761cdc8e82309c55bcb931ad9c146417fe5f1a8d5ed02ac6ce887e4750b158

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