Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f641be994663425…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 01:38:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 65faaacff6c9a2e1ca0d50ba835faccb SHA-1: 7e9427ee9c6dd7d27b3172cc46312b2a7a97b835 SHA-256: 6f641be994663425e9ffc31b7fb1c142c967ee8ac98d5a77f2bbe6ae1697f6f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm hosted on multiple disposable domains, with one URL specifically pointing to a compromised WordPress upload. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a network of links on low-reputation hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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 http://ankaser.com/userfiles/file/51724642174.pdf In PDF document text
    • http://biosystech.com/pdsFck/file/21392315871.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/vururekirajefozabupesizux.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/45543785233.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/35837064713.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/11848236358.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/28454819290.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/2000202840.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161465874e0d51---gavopofegusewagidu.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/muwavapimo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0f3d0704e6e7505ab6bd07165ce74a03/zejunuvosexozuxijap.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/seketozuvunadagat.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/99167399936.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/5bromaet5487ovrco38gr4sjbe/16308398189.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/99486715047.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/8488598838.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/xasore.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/gotuveduvuvubosuvijijo.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e434c88f---19292296178.pdfIn PDF document text
    • https://rajakedua.com/contents/files/95472350965.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/jafebe.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecb4793ce5---xakazilegasex.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/56193042575.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/fuwawitizomepipati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=gta+vice+city+pc+download+apkPDF 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_off0000ba9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9A 10636 bytes
SHA-256: 3250864a3a555e161ddee87d788979104c0b51405d90dd3e43675e240512af65
font_01_sfnt_off0000d32b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD32B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3D 16412 bytes
SHA-256: 4ba34332c60a6af75d1151d8e447266fabc9a35c0032d6ac5ef4c06cc3ef9458

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