Malicious PDF — malware analysis report

Static analysis result for SHA-256 d34d04de77383d25…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 17:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ad8960a65fc800b8956922256343a9e2 SHA-1: 094df6f56ca3f7ab9728947d1e9a639e736615d1 SHA-256: d34d04de77383d25925d55a32b1160cfa1d79f387f65bbbf7669d364d439e5a8
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to compromised WordPress uploads and disposable hosting, designed to trick users into downloading further malicious content by posing as a service manual. While no scripts were explicitly extracted, the nature of the link farm and the ML detection suggest it likely exploits PDF vulnerabilities or uses embedded JavaScript to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=2005+yamaha+r6+service+manual+pdf+download PDF link annotation
    • http://booklandbooks.com/userfiles/file/xugunugotasaxo.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/musili.pdfIn PDF document text
    • https://aedwea.com/upload/foto/jigelajizoxedogazesavu.pdfIn PDF document text
    • http://adice-area.com/pictures/files/82439991162.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f968ba2e4---86988756771.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210529203502.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/fcbc6bd2ddc43b82880305954dbe961e/xesofuzukovuvitawamit.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/favana.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/44376600582.pdfIn PDF document text
    • http://krikrik.ru/uploads/ckfinder/files/67928336823.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/12b660f87cdb0d3486d3c374968e1c38/72373887509.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/rujokaxisogipanukisaguw.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/kelesuxodamutavazopewe.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbde3bf0ff---94761048578.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/lezagepibo.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/41490672688.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1e7907ae086ec49e032f642ecbd6d7c9/4609262480.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/1045972852.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e8491dad06---zuponupumamumevewadajizul.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/30182114679.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d13dbe84---zakiju.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160821917dc377---wonawifeni.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/46a02ef01950209953f88541f7c7a3b8/29486589933.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/etrdclgnvbep4jnl46djgslr02/98002834294.pdfIn PDF document text
    • https://balticstroy.com/uploads/files/79256790281.pdfIn PDF document text
    • 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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91B 18044 bytes
SHA-256: 07f55a609bc851f1fe87ed53ca29058382e22d91260d212b5d4c3bcca8c8f00c
font_02_sfnt_off000127b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B8 11600 bytes
SHA-256: 8b0ac95f30761d2d27653ed7db31a51632fc3ad6015f9b775e663c0f3c037f6f

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