Malicious PDF — malware analysis report

Static analysis result for SHA-256 21bd8cef7886cd19…

MALICIOUS

PDF

76.0 KB Created: 2021-09-02 18:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de1da0b9540cc2168bcf7f1190a2c83c SHA-1: d7065a7747d334a970fed5b8e64d2199457df1c4 SHA-256: 21bd8cef7886cd1927a0ba5e478592fe41b16ae1d123c1b0cf8a90ad1f07a904
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score strongly indicate malicious intent. The primary attack pattern involves luring users through these links, likely to phishing pages or for further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 https://smidgel.ru/uplcv?utm_term=class+4+all+book+pdf+download PDF link annotation
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/gegivudadosadifeji.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/e818254fe2441cd42e9667b274919fa8/22074879743.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/fijedomusoluteribikos.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/32170412963.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/31057873713.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/86007838325.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/88230248866.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a4b4af7be92093133ae8f8eb58c36efc/59080114070.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce7b436235---16038017616.pdfIn PDF document text
    • http://halmar.info/userfiles/file/99789924911.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/c0sqm8v5bpdtb0ctcr48vmiehn/xovidemini.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/4165f588d89c94784cdaaa200c7acb64/31478577525.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/30023897084.pdfIn PDF document text
    • https://aquatim.ro/uploads/files/lifur.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/21560615496.pdfIn PDF document text
    • http://01host.ru/userfiles/files/gesizekotor.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/43qum27hl1r8vlqov2qp40k6p3/zatofezagilusedifezoxan.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/23e5baf5ddab202535b442d5bc470c29/38340599709.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/bvqecgeemgqtlbeq3p2mocn9rq/vuzogorok.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/16860ef6df4be9bea7a8a508d89b47bf/23586742656.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/rdncp2nq05bne9s258p8n1mog0/1485977635.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/93766433713.pdfIn PDF document text
    • http://cl-pub.com/files/files/mutiwepapetozexexuvi.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/62047307005.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d757fb96269aff887bdbf57ec66da141/luvofaku.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/38399026192.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160746052ebaf3---lobuxajolawojebelogapuj.pdfIn PDF document text
    • 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_off0000c5bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 17436 bytes
SHA-256: c54f4ed2b7cd2657c6a71629e97c1871ead8b51d5849dd7f452938448dbf7516
font_02_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10496 bytes
SHA-256: ca37e0bc78062d477f7fca408bfe71b2dce7a674ada210d947333858f573848c

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