Malicious PDF — malware analysis report

Static analysis result for SHA-256 00db91051d000504…

MALICIOUS

PDF

82.1 KB Created: 2021-09-01 08:38:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 996fc5dddcb6de2347d628b8643dcc3f SHA-1: 0a39dff7e9f12439fbdae83bab19248bf9bc2e3f SHA-256: 00db91051d0005044c80c0836f387c3bb7c0cf25333710cde44745f8e48fc6b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further malware or leading users to phishing sites. No scripts were extracted, but the structure and URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6c7680c5c---68197108075.pdf In PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/koribedojenedudisotu.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/dewafu.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076d61c52d0e---77000237699.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b03e190684a---81295900924.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/59163073785.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/28738140619.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/063110608ffc9725da947ef29ca32231/mididaxozaxul.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160988ba350d93---jidemasesis.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8303b8cca1.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/82492468887.pdfIn PDF document text
    • http://bhs-class1957.com/clients/35434/File/16020859897.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/dufasemesakosarupukunin.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/jemowi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/5495279357.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/67159786744.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/lonuteropi.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160852daac70a6---54992809275.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/93947587675.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/xajuzuzivazodalij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/bbfa355826e025905874166b511a8391/pamulafiboz.pdfIn PDF document text
    • http://vtaky.sk/media/file/16443313552.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/kemubu.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/xojunok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+importance+cannot+be+overstatedPDF 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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 20308 bytes
SHA-256: 0d2976aa53bdfaacc5d9b1d804dc9a01b783207289a4f518de0ef9bb20008293
font_01_sfnt_off00010768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10768 10904 bytes
SHA-256: 6bc60479acd70b0953f8f480be7c038dd01b03a48d2c144c951552993c34e54b
font_02_sfnt_off00012046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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