Malicious PDF — malware analysis report

Static analysis result for SHA-256 972ec0af8acee11f…

MALICIOUS

PDF

80.3 KB Created: 2021-09-03 16:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: a25ca1244db9167ce6da51024f141186 SHA-1: 940cb9e13cfe9a94f3e9569bc902d4d22b7c25b9 SHA-256: 972ec0af8acee11f8288792f842767855d7e229fb0e3ba93cd88fa36f11f025c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://catamma.ru/uplcv?utm_term=hereditary+nonpolyposis+colorectal+cancer+pdf PDF link annotation
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160d3d37e430f8---puvodi.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/95888276459.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/fafozitimow.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/emfoson2ccc8m9jl822o6mivh6/lezobabel.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/68463584489.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/71021691675.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/veguxederuj.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f44cc69d8f9---zutomaxun.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/99830403586.pdfIn PDF document text
    • http://suleymanporoy.com/img/userfiles/files/32341617608.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/dofowemuboxoruzotevubufe.pdfIn PDF document text
    • https://atlantidegattico.it/file/nomesagik.pdfIn PDF document text
    • http://playfromhome.org/clients/4/49/49939bf6a151252ba1adfe53d1befa29/File/5716568070.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1b6691092---didolewot.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/mowuz.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zevimososuxeju.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160adf900b4936---57089493569.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777101aaa2b---91927028625.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae8b5f216---45292323327.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/32029096356.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/36117945656.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/44987774152.pdfIn PDF document text
    • http://zonwering-nederland.nl/ckfinder/userfiles/files/wapawape.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad87f1258d---kalulufikekokixe.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/91936184138.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/802sktq932hrhdqk3tmu23chi5/dabofil.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_off0000d711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD711 16820 bytes
SHA-256: 4b1b09ad2050029961503ee1e95ce8848952b9861bbfefb2f561af9ad45d28c0
font_01_sfnt_off00010256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10256 10716 bytes
SHA-256: cbffcda8dbf40903e19195056a556b798ebd2ab995fd4660a368996e91271c84
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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