Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14f5071dd755924…

MALICIOUS

PDF

78.3 KB Created: 2021-09-07 10:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b39f9bc7d55f13e6b10d9b1b05d6f902 SHA-1: e22a99a4f0f036f3b90ae7ede97e75768bd5563a SHA-256: f14f5071dd7559242714aa0924ab873d76d1bdeb887e433f362228129676b71e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=sanitary+engineering+handbook+pdf PDF link annotation
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7f418ec6b---97291458731.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/m0tg6fe64ls6jil94bmo0vn9e7/sewukizasogigetefo.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/n8hlr7q1jtjc8ge1v939jkbpp1/mabipadalunirilofaxigugos.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/57386879512.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/sobonelinalamelezozu.pdfIn PDF document text
    • http://huemin.com/fckeditor/userfiles/file/xomisitanedev.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/79854663727.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/gomidifiguzatajibadamarid.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/fijajedeniwegufediwafajad.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/xujozibajajolenewer.pdfIn PDF document text
    • http://crmrealty360degree.in/ci/userfiles/files/91845504043.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/nuzuve.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/713bffc2a4bfc27c97c72432b533b804/polalobudezajezoz.pdfIn PDF document text
    • http://apex-architect.ru/images/file/72018421526.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae0b97d863---89795599090.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/xozijosuzo.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/wenelutizijewapisa.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/f44261b8d2962ed2803167c58ede1af2/8035190832.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/32963902053.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9b81ec740571a1e464ad79785ef0632d/92905954960.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/ef58ab85fc1edcd957c965e4f29b3549/45568029538.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608530d9bb958---90559082199.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/xusiruwojesugojokipiw.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ae0b61c3a2dba20fd086970ca3ba57a1/ratadukewolenif.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/60231409038.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_off0000ccc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC6 17532 bytes
SHA-256: 27548f432f4ec4a2db139ab8e5c39ccd44f1175d929e0e081665339c4db27603
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 10984 bytes
SHA-256: 4c431a14423de062e20ccc4c1264f3c78b5a5563adc9709429a7ab2330500eaa
font_02_sfnt_off0001138e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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