Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85f54056b9fba91…

MALICIOUS

PDF

80.6 KB Created: 2021-08-25 14:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69317839bad2c5e7c6488cb1e1c8984d SHA-1: 07549062bfcae562e39cf8d260decc437d2320fe SHA-256: d85f54056b9fba912afa42805b6d941b5723203558b11e10273701e51621c482
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 compromised websites, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces this, pointing to the use of compromised WordPress sites for hosting malicious content. No scripts were extracted, but the PDF structure itself is leveraged for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allprintusa.com/admin/images/file/kujali.pdf In PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607402672fc00---duketejiwuzofesarubu.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/peludopujabodixoku.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/joperakutovesa.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/87b9fcd0e8c55f7ff9390192b12dc232/80612631580.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/79247823967.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765a8aba0c0---39550792959.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8c11dbae253bf32e72449e0881c599f5/66534869295.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/fb9083120e72edcd311972208dd0a4ac/30155323900.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/d53e7c754f2cd87defd29e1c72f46c55/ninulolalel.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/99967340239.pdfIn PDF document text
    • https://kermiradiatoriai.lt/images/files/navetuturo.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/zigisixujeg.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d08802c91---77756784355.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/sutinofurudub.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160d52f5019123---jewekidaveditusulogakale.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160be7c94d9ee3---pelalavuzapuvutawinapide.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/puzigelojipape.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/ekkat78khv1r3jldr8q8s8b1d7/73066741299.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a498e8b8fe3---25714208708.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb379e42bd---48595445264.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/90326281557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cooking+mama+dishesPDF 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_off0000d9bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D6 10576 bytes
SHA-256: 2841b365dcf07724629c1839d7678a5cc4bed862e2591d4c8826b87058d6151f
font_02_sfnt_off00010994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10994 16824 bytes
SHA-256: f7c2169d65f04a54017eeb47e714d023bcedb607c53838b7710515417147eb21

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