Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3673a72de25895a…

MALICIOUS

PDF

105.8 KB Created: 2021-06-29 05:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 595bad5a10e1f785cb42fa1af5a5a1fc SHA-1: 23fc25f75c23d7f0b79f8c5c37c599a105f2d474 SHA-256: b3673a72de25895a6a742430257957ce84bb0465c83f7f0775f2ea4b579070ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to lure victims. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate a phishing or redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160da4c855e5f6---tizewuxegoxedalitujimase.pdf In PDF document text
    • http://maduraigarlandshop.com/userfiles/file/21043788778.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/60320e831f1e102add5d158e1b7db7e6/rigutomadevafadedi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16091e315e45be---gununanesajifuzeminugaru.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e2b77d0c6---dedezixu.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/1243517233.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/6cp51j7i1fa6mv311ebp3fll64/vezinokukezomil.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/64952743371.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5fd04874a---romuvopikitux.pdfIn PDF document text
    • http://npas.ru/pic/file/40507410590.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jigajalaxisexifuluxoliko.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/9381c611c41ec1f3744fd31cab38f55a/gobudativatumopob.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/22ae4ad3c0520bbfeda529ab686e7c62/mawumexuzumuke.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc025ac503e---zomakesavisemeraro.pdfIn PDF document text
    • http://fxmeat.com/upload/file/cc18b42650bfbf389e86930bdd8dee26.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/tibubizufezowemujapobox.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/13474689870.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/gikububuzomupo.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/970a310d0ed00a977a982f16ca75789d/pajunopozerijuna.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/46070838648.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210625015654171.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/bec03505c0db87d499511e98462b7079/kijikezididi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62d44f099c---sesusobekonapogeniwivazo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=rude+and+disrespectful+synonymPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF63 26548 bytes
SHA-256: 9c7822c926550d32e057b23cb4015aa16b727e1aeef34cf49e206d5c8702bfd4
font_01_sfnt_off00012f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8C 11040 bytes
SHA-256: a41987d0bad9e4c37d37525d45fb6313a50bba30040196a1882764ae4a1ec572
font_02_sfnt_off00014946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00016153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16153 3332 bytes
SHA-256: fb3e9c0e9cb2ea8b9aa65f9e2cb683455b3a736823a769d4dc9281518d2f5c3e
font_04_sfnt_off00016ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EA0 22356 bytes
SHA-256: cdf3bd706e704a1a919506b1833f4762ae202993fdc21a536a3718b561811aac

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