Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c1d39e9129d708…

MALICIOUS

PDF

82.9 KB Created: 2021-09-04 00:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb35ca417ea5f10ee1103d3bccc5f48f SHA-1: 91e224442bd3dd48442371ba1fa286fbfee73a20 SHA-256: 10c1d39e9129d70806cb09632fb78f94751b90f5f67c4f68c622ca952dd66591
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/olvorja22t81s1bnmndeqca0kf/52428194855.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d499778199de6ba87dd3eadb63ab4760/98519544785.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/tuxabeturipanegevalozole.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/84643140560.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a46c88f8d---jetegom.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/59414791573.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1610f37d92ee96---27116424997.pdfIn PDF document text
    • https://commonwealthsportsawards.com/userfiles/file/viwalenuxisutanuk.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a285152c5a5---gevegidefaxopalemirona.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16112fcf8814ab---dowuzixulewadipetolax.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094213d9b267---4171035074.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d6982c00588---30956035438.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/libena.pdfIn PDF document text
    • https://silga.ca/userfiles/file/51482699179.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/zosowesebirarolos.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/ledodupimavizoki.pdfIn PDF document text
    • https://ksuskalology.com/images/file/53151226811.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16097325f88c2f---wadolomafunusefedemuka.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/koguzumo.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/pekemevivawisumelim.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/26465098228.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/44c532d339223bf6ceeefdecef350d75/mafaj.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-8-18/20210818195036517531.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/kasamademugujikiso.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/d43400b2b5d93d012dde02f58eb975bc/79529708753.pdfIn PDF document text
    • http://nktrading.qa/file/files/zamonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=attestation+de+domicile+chez+les+parents+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_off0000dbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB4 19292 bytes
SHA-256: 07427185e90e96b9b7a5b003f2d17f670c1bff21f39732ae9b3dbbe85db43350
font_01_sfnt_off00010c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001244a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244A 10924 bytes
SHA-256: f9bba18b29d8356583f917e2a65e348018a9818c4d9dc4e5f41f7d3338fa3b1e