Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ae10eedbc995d2…

MALICIOUS

PDF

90.7 KB Created: 2021-07-05 00:34:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 897c1f0aa8e9eb0117c3606caba79daf SHA-1: 638f7a7edbad9856f365eb79c12553b25408c675 SHA-256: 24ae10eedbc995d24fa25c0ccb6453d01e41a3b072052c25f8b77699d4e82287
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous compromised websites, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings indicates a deliberate attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/1m5bn95ce5j7j1825s1bkndg3p/dixapobikanilike.pdf In PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160884f820a4c2---55125389845.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/jajebozikim.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bdef65dd90e---58100711897.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/loxaji.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/38359198684.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/50929183810.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfb6e9718801c7d7b19d0529a1bdc2bc/sovewazojez.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/78526686054.pdfIn PDF document text
    • https://koffiewarenhuis.nl/app/webroot/files/userfiles/files/vuwilanasa.pdfIn PDF document text
    • https://agermag.ro/mm/file/22935330437.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d16c4b92d---72681059564.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/dunalewatalupe.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6014eba306---63622162315.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/ziwunobikiruvekipoxesod.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/mogoxatirexezuradurudadap.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/afde7c7dce72ba67ca1f719254a9f22a/rivujilidasoba.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/3ea4c27ec9425ca044c51b1ddf55fb5e/kozodexawekix.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d1be139d---13604835920.pdfIn PDF document text
    • http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/86953164054.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93de82b90---45298854180.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/dfeba510c7ca3074a8c51ce9f706b4dd/27667582746.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/37301605520.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/siponod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=knd+flight+of+the+hamstersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB9 10792 bytes
SHA-256: 7572af75ddf9288545cb8615b51b656a97b668edc8952917b0133ae37e74a695
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 21884 bytes
SHA-256: 6af94c6f933ff71b2fdcd510c1f122dea32a0e36b93e0bfd13759aaf0af01043
font_02_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001478d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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