Malicious PDF — malware analysis report

Static analysis result for SHA-256 648fa7ef4bf9735a…

MALICIOUS

PDF

71.2 KB Created: 2021-09-02 22:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1fef0a3966af9856cc072f03c9cd93f0 SHA-1: 3858471be7e7670488bdda63398a919e1b5ad32f SHA-256: 648fa7ef4bf9735a4a0dcd1dfbb6dc27d222c84cf4c8f129ff9fd5fe626dd0a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. Heuristics indicate the document functions as a link farm, directing users to multiple compromised or disposable hosting sites, such as 'nomylo.ru' and 'chv.vn'. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=doc+files+to+pdf+format PDF link annotation
    • https://chv.vn/userfiles/file/dobamaxategexegukerafujan.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/nuvutijesateketalof.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/matusefonefoxuba.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/zetelevujibukutulojowid.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/efea21efe646fd9e753c59df39469e0a/87692710310.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a24e7929e---movasonagibaxeroxexute.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/q724q53taeeqgq5cjcc73gcfq9/97006468898.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094589128486---sudevipipilejimarigegofis.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210823_F3441FB316F9B3E4.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e0985a1b30bea965040ca7cca53b3e5b/bofifaxov.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/gelafajatexutudi.pdfIn PDF document text
    • https://chpcentre.com/files/file/tefub.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xazebovirozewini.pdfIn PDF document text
    • http://lg-palette.com/upload/files/90611233145.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/6b31llkvhpmo3ljr1bu78rh755/gobamazu.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ea6f68823---58599557859.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23739161939.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/44935301548.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/48186812564.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/9b5777637508e56fd97bbec20a8e442b/nunedumife.pdfIn PDF document text
    • http://nhahanghienminh68.com/upload/files/44878303164.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_off0000b3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDA 10680 bytes
SHA-256: 7d967e640c99357cf57d899f9604b76369e8198d902cb6fc15fb3e3d91e5a496
font_02_sfnt_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 16164 bytes
SHA-256: 01bf04b6e2146aa011c4371c06298f5d1710fbc06b505339a22a5e211203db10

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