Malicious PDF — malware analysis report

Static analysis result for SHA-256 6108dc5c0f659f71…

MALICIOUS

PDF

111.4 KB Created: 2021-07-20 07:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71938f57cc179aa8445edac5c0cfdb79 SHA-1: 6f650f4aa36fa5ee70df97ff889432970ec6de29 SHA-256: 6108dc5c0f659f7153edf79a9e7630a6562e6ff59e28ecd4c215072adf8d54c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm, with many URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b29baf96b8a---merazusuzopezubosopakawur.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/55432963511.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3d427d22---turemibewajixisazonetaxe.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/6d04d4f5c7022d260790d07f7bf075e2/71632378884.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/badozor.pdfIn PDF document text
    • https://biocoils.com/img/file/gonego.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/25679009144.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95172d86c---11539588002.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b38cf432a2---gegafotifov.pdfIn PDF document text
    • http://slsnn.ru/content/file/nixasiripigor.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/kiborugup.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gogk38k9ovv7ql3smej1tgp9db/kotivuvuro.pdfIn PDF document text
    • https://btegypt.com/file/nowuxiko.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/70dc9a1e9446deed39e881531c01459f/29726735254.pdfIn PDF document text
    • http://jessie.vn/images/ckeditor/files/pifonovig.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160748bc4bd2ac---wizonajorata.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/65808f19ef69b453b153780724e6669e/zifekegavomizomalotasemi.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qdcttn20dqm8esfqgnq8tim9b2/90220236621.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a404f4488ac---98313454995.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/84476597565.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/11272740592.pdfIn PDF document text
    • http://klasykarozrywki.pl/public/images/fck/file/76972952817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=specialty+butcher+shops+near+mePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16225 11068 bytes
SHA-256: 71e204c862ce10fa420b52dd575491d5d554fa8b0cdfd82374b1e540efa0ed9e
font_02_sfnt_off00017b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B86 19676 bytes
SHA-256: b9ee6f1249d3638bc4a745bc0a805b782cc8dde48e2ff52dd7ec517f99ae3f30

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