Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f76315bfbb6e8d9…

MALICIOUS

PDF

70.6 KB Created: 2021-09-15 18:27:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 623e344293f1ca373ca8085b2c0ee6ad SHA-1: df95bb57b0ffe74effd290401dcb6ba5f823a881 SHA-256: 9f76315bfbb6e8d902d759255372d80ef7075ae1a5e6f5f9fcd09d569203bc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to disposable hosting sites, many of which are disguised as file uploads. The presence of 'utm_term' parameters suggests a phishing or SEO poisoning attempt to trick users into downloading software or keys. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=internet+download+manager+key+2020 PDF link annotation
    • http://tythb.com/uploadfile/files/99356499539.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/juxen.pdfIn PDF document text
    • http://aligokdemir.com/resimler/files/41995736028.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/161326b9ec6b89---66397697021.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bibanemeruguzuramoxenad.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/pilamig.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9fjtkgkei83eeubh5b9qnodqv3/rezexawitifojudobeterob.pdfIn PDF document text
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/67990627881.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/29083859959.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131ce29aa6d2---45062147520.pdfIn PDF document text
    • http://teplospectr.ru/images/files/75199036752.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614030969cc41---wezoxij.pdfIn PDF document text
    • https://zahrek.com/userfiles/file/74231503103.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/43391105959.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-14/20210914033635648253.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc35cf2836---tezatufixasiteki.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/3770473524.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/tomekimuduvarofarobo.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/22400493222.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b3f39dba---47864670847.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/8661ab77e7237c483d0a9389e3d3fca9/furuwodojisumavimotaziwo.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/87666800777.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/lakuziwanubavaxugeridi.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/liwedot.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_off0000b6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6CE 14752 bytes
SHA-256: 607a78b0d63787116739a30bfc7dfeb9ae036b603d25c0981db8aa8180c702ed
font_01_sfnt_off0000dbae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAE 10816 bytes
SHA-256: b22f7114ef2560dee4fd3682dbe8dfdd6f8823a96d84741d4e0272ac9e7d0386
font_02_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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