Malicious PDF — malware analysis report

Static analysis result for SHA-256 25d60702ffc5d330…

MALICIOUS

PDF

94.9 KB Created: 2021-09-07 07:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09e1eca8bf82aefdc02bf837920f2e9a SHA-1: 83f58e0e5fe0419bb081bd4f638fb8f10529cad9 SHA-256: 25d60702ffc5d33014a615fc86e747982979f8f9189f0b1c75fca68483a2a963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd42b706c55---semovafetukegasoruvibuzid.pdf In PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160da7634b8b90---levosodobozufamugarug.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/lelapu.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/bufivorepelusimizosud.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e91073c28f06ea39473b85252f00c69d/viler.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe0e3006f6---wirizosemigaluxavosa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16081196860b16---suzipipola.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff61d8d990b---14601718632.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/35966382721.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/86832854394.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/momebefelilojom.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/160033499.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/43819333354.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c597fde82c73a511b909d70cb1114b72/58853881912.pdfIn PDF document text
    • https://carlojans.com/cms/file/gidabed.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/dujonubixis.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/33813342875.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16118da3883c69---13444740203.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb22263f6f---80814297148.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/difuduzupexotujomu.pdfIn PDF document text
    • https://tbsva.org/Upload/files/20210705205903.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770e306701---jibudapuxemadebilofe.pdfIn PDF document text
    • http://forspeed.cz/ckfinder/userfiles/files/dufutupazizuze.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609496e54ab48---dunefetofenakeladot.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160946d11a91f4---funenixatuvebozarenekebis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=libro+de+calila+e+dimna+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10612 bytes
SHA-256: 9a25db5083d45a4357553eae9d3d39d567203f5b7ccfc8e10ad21e126285d00b
font_01_sfnt_off0001241e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 19136 bytes
SHA-256: 7c4e4c42cebc749fa1694ca7dd696771e50a0f9eb5e17682d6421b215409c783