Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2decdbd7a1ab17b…

MALICIOUS

PDF

68.3 KB Created: 2021-10-01 17:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eafbce70ff7695e34d36674497355a85 SHA-1: a39667a2a4114babaa6005a3cf43880ec80d616b SHA-256: f2decdbd7a1ab17b90478411c4f0981fd11f326948a77a7da17c6d0f1dda27eb
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tourbusan.net/FileData/ckfinder/files/20210910_18E1963E3BC15892.pdf In PDF document text
    • http://nrgmedia.hu/files/file/suvafofurizesividexatof.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/luwivalasupufuboru.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/63537748003.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/7d2ffh35m6hsud7h3ktnlklq8f/nisuvaxexixofopenunaf.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/28704237212.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/vewixunepipilaxinogozarud.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16146ac887da29---nonow.pdfIn PDF document text
    • http://umffz21.ru/admin/ckfinder/userfiles/files/2428903616.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/86804452961.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16142b07491edb---pujibukopudamenire.pdfIn PDF document text
    • https://digireg.dk/upload/77491813867.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/wofumowo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ba6785c606---penerajajobuzadijakafovan.pdfIn PDF document text
    • http://plkorea77.com/ckupload/files/82308138556.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/58004706966.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/9720501230.pdfIn PDF document text
    • https://arslanemlak.com/E/file/In PDF document text
    • http://france-ex.com/images/blog/file/vebexazifodilesub.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/datoje.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/tozajajapifipovoduw.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/52103944973.pdfIn PDF document text
    • http://trieuduong.com/images/Download/30190672295.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/50769125478.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=wwe+2k19+ppsspp+downloadPDF 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_off0000ae9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9B 10608 bytes
SHA-256: f1b9e3841d9ff60c4c1de7bf6b0c8e279c982ffbd8fc251d77345a83f51b4ba2
font_01_sfnt_off0000c725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC725 14752 bytes
SHA-256: 668e9d84f14d830c9b3c604834cc957908c758a16858eac6c9942ce4c73a8be5
font_02_sfnt_off0000ebde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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