Malicious PDF — malware analysis report

Static analysis result for SHA-256 105c26829921b785…

MALICIOUS

PDF

93.8 KB Created: 2021-08-09 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: acf2cbe15d689d753f0dc04602f7ccd6 SHA-1: 66324fb5704031d46fcabdde837b2ace8003f9a1 SHA-256: 105c26829921b785b345634042a90b6c2f0e199ef51ca9d3f73531b195ec6b79
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, flagging it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d1d061d.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/egli9dn0sj5r5m5cvtrkqd0hkr/15632739952.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160ad67cb7b0b4---rofidezib.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/83412413073.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2ifeqh6goudkmqcbk25js5co20/mufugazazurum.pdfIn PDF document text
    • http://dalaichau.com/files/virafetisibafarajin.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5acb1b63ec---wuwosodudaruvegima.pdfIn PDF document text
    • http://gwhs79.com/clients/867100/File/37744985086.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/dabosozatuxa.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/latutudavejatuzojome.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/kikoguzadotaragadu.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/c3nv4u4sgern61jkm0s4g3kgkn/53585414199.pdfIn PDF document text
    • http://deauville.ru/files/file/74634748664.pdfIn PDF document text
    • https://gyandeepjkss.org/userfiles/file/4806808318.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/f7a82b5ae58ff7eb9bf117ac51e821f4/rudewidorik.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/99d0dd52250ed51665cd58e55d024abd/gakexofaxetaka.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2efa254a26---jibusegewuzabepegekawujod.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/vf5gcu4mjhn2tboi5p7gks6gc6/22493803189.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/85727584294.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/bopuxelazediwifi.pdfIn PDF document text
    • http://djapm.com/userfiles/file/10166979482.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/63808726243.pdfIn PDF document text
    • https://comfort8889.com/upload/files/61406962071.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/34922432448.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/44787743444.pdfIn PDF document text
    • http://xn--d1achljw0b.xn--p1ai/content/upload/43600766954.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=when+does+the+sun+start+coming+up+in+the+morningPDF 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_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 11008 bytes
SHA-256: a4469161d8d3cc9a359408c1cdd2c1539f2a755680d3eb4b68b601f99e22a145
font_01_sfnt_off00012272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A84 17548 bytes
SHA-256: e253001b166804d35c85a17d7318a0c6d3871c4db2a80a78ade7301df261abbd

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