Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d72432e839a3e3…

MALICIOUS

PDF

85.4 KB Created: 2021-07-03 05:31:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: fa4f57a8b92eeae023aa45ead68f2914 SHA-1: 61ac9fd0e9b9db10fdaade215e6290c03fa3ad8f SHA-256: 83d72432e839a3e3309779c3ddaf0643bbd2d07c46369072237505b92936eb2a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of multiple distinct hosts and a high number of links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5d0066da9---fivegiruwinaj.pdf In PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f40f944c34be37b317ebcfb7cba4c1d8/jabunolopeg.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/tabife.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/mjbboibeu6gj8ann442ncde9ug/25041452921.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/ximenikefegatin.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/de89dfcc4ae22d9b0be205b4101d50fe/38269126607.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/ff002de6b0d93e780e4ea27f4ef0dfb3/17653882037.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rfjec0gpaa3pg28qo72qti9ck5/63408776622.pdfIn PDF document text
    • http://boeschfamilytravels.com/clients/43210/File/65919265085.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/40624057bfeb51a6f94a648d7a067b9a/gefosotelodekeniwejoj.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4cfc7ec4---66619232041.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16083320ab9ba1---gabifozulo.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d192e2c4e44---nojokekajozuriro.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c9424e927---sisavolatuxiparel.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/191e04e64cd3ac7d3a5fffedeb98d0f8/kofedolesaturad.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/5d6c241f0681b158cb08a5cab894ceec/5586713975.pdfIn PDF document text
    • https://dineflon.com//files/loxubesokugokutupitu.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/9veh4mckf93u4v7tieuhnakhf6/xakewagopizewareli.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/cd0dd8e346c8c9038ea9566e6f4f304b/gofosewewitedolaromod.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/eijal57ja3rpvkmftgs8of6d0q/57228384634.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d78cf409561---lekegi.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/6918960669.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5bfec2a69c---4776015164.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/95f9053bea74deef4d9674f2638e545f/visopetegojipige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=marxist+literary+criticism+todayPDF 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 17172 bytes
SHA-256: 1102d8af34594a5aa64c789c31c5cd78c6256fe9c0ff24638a99306842f532de
font_01_sfnt_off00011803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11803 10636 bytes
SHA-256: 154ecf9f3c7e384eb0c312fa6a12c85be727eabea3378ce3dd948c1bf9ff8dd4
font_02_sfnt_off00013074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1