Malicious PDF — malware analysis report

Static analysis result for SHA-256 1845e6792187b494…

MALICIOUS

PDF

91.7 KB Created: 2021-08-04 01:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 34ff509c73d6139849400a6a663c57af SHA-1: 6267839d1f40e774bcef2cfac0099351b99dbf3e SHA-256: 1845e6792187b494a248342b543e20bb0215f2fec554134c393789f0c463b135
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic findings point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=how+to+play+chromatic+harmonica+24+holes PDF link annotation
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/fdbca9394e74e1ec221fdc5e8bcbc137/dagiwuvodeme.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16091c212de3d1---fefewedox.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a89263067---28726045270.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/76138094947.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/suxanunas.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/40e560c511238efb762cad4a3dd0002c/tuxokijijekizokumibava.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/13421363659.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086830990996---58160361824.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/29476570687.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/48016517944.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/nl64tv8jv69mv6p7sjstn6ruc9/sudumilori.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/955006810.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210523025624.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609206929815f---51195638559.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/9500465164.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/mebererozezunapowepadulel.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/be63916fff0c00a1b97acececfc24016/mufuwati.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/rojodefesi.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/161001dca54097---26923737191.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/91692285460.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/761575410.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/98033711944.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/29295763164.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_off0000ff43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF43 11028 bytes
SHA-256: 4a6b82f2ed4e0588c498cf6e292ce4ef68a17810959fc750d77163eacb820635
font_01_sfnt_off000118de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F0 17272 bytes
SHA-256: bbc7db851be45f8679de8fca27782e7d7545f0e8a6f9632f0a5866c02d50c2cc

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