Malicious PDF — malware analysis report

Static analysis result for SHA-256 3859b4d45f9c402c…

MALICIOUS

PDF

75.1 KB Created: 2021-07-05 01:24:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: f7b26a10208a272bc6ff110703281ee6 SHA-1: b9d32ef975e4f0fa845ae25b2c7ab89ed2f2471d SHA-256: 3859b4d45f9c402c3dadf083fc70a2aa8ff3b0aa69c2d6b666a10a76d7f6e7fc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites, likely to distribute malware or facilitate phishing. The presence of numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest this is a lure document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 http://btc-ltd.com/upload/file/66653900751.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22d04953d---kemewowo.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091aaa83beb6---92146561658.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087970d5006f---xawezibukowazodu.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecdc9a1053---supelilamebazizavu.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609da0e2048e4---xazavefetexigivoko.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/315548f634ca77cf11c68f66fa37e7d5/60460829357.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/34017378168.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d195d7c4dd---buzokorifek.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1821f8ca---xavetisatajexil.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/41ae2e18eac8fbe7996f602f2b949afe/93307291993.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990d0e13640---18864442167.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/7480798238.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nanntl85vkki5knq5tat2gqi02/76602146139.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16077de6fdbd71---pukobo.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/96b370dd4a1417feca2f462a66149df9/54962225281.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/d2e4ce7844afe1010bde7e8a571d95a4/ruwaferaralonovubidebe.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7c4dccec---869079299.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/73522962428.pdfIn PDF document text
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/fupijuxalokagonefi.pdfIn PDF document text
    • http://hosungtour.net/FileData/ckfinder/files/20210704_5553B178D754D6E3.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16077358b43d4d---50239231377.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/ef88de61c8cf52113da64dee7566c6ed/17518997328.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607de4064b31b---sazujesu.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b99e71a63---jadivewokifaruvajuk.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/jegowagapip.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/nitulegogizuve.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/kavax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=beauty+wise+dominicaPDF 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_off0000c428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC428 16628 bytes
SHA-256: a0d568c9e266bd55412b79163fed037051c5bb0a115efb54b5a9b8674f2e5ba8
font_01_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 10740 bytes
SHA-256: a3506ccdd0a257411199faaa2c4cdbef05901c4f62f220611835cc4cc92890b0

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