Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfdf427e7fb64849…

MALICIOUS

PDF

107.0 KB Created: 2021-06-26 07:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: 3d45d55145d0152924ddb2784f431fa2 SHA-1: 750caf355e5d3ec6f37d532ef2d7cf6b993517b3 SHA-256: cfdf427e7fb6484999c657aefb383ce9e97309ac4b9bc5539406ce2e27891938
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and does not provide direct content, but the heuristic firings clearly point to a link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://urgentcarepb.net/userfiles/file/48863632059.pdf In PDF document text
    • https://alamansyria.com/userfiles/file/45566783391.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d7d72776754dfc0c32adfe9f2864a2e0/rodixaxa.pdfIn PDF document text
    • http://proxima-design.cz/files/file/susosavofarigowibidexev.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/37693948473.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/girozofag.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/e3ee5fc7e0c8b9f5ee24199dacd3aab0/regujutopisurigepojat.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/kobupumajasumepimigujig.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097be8ce04ab---73332467012.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/h12gfu5af7sklt39n5l4r85c07/jamurajisonal.pdfIn PDF document text
    • http://sukhabalka.com/files/file/rogewajevuzafunazifezaza.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608eca80893ad---fajajikinikufuxejuva.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/lozujumubepinuvawemitum.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083375c9bbfe---ginavojafipu.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/nunijodutijuxusif.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/afbe0ad03bbc416e43722f8f6117fa9a/xejajewinetunuritalud.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a2e89a96ad6ca6e7b49d505223553e1/mefabigokogagetivekavu.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/sakovegiz.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/poxuvezemixodakodudi.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tarava.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf35aa2231---juzunon.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/kuxow.pdfIn PDF document text
    • http://industrialdevices.in/uploads/72733653641.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/8fg1mali1t1cbnnp1ocdh01773/13299423065.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=personality+development+quiz+questions+and+answersPDF 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_off00013b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3A 17976 bytes
SHA-256: 087eb87e836fda70a31a458d746327e7c7699fa0fa43cb824b4d720ba6504f6a
font_01_sfnt_off00016a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18273 11124 bytes
SHA-256: ccba8944a50ccd9bc4fe4eeaae14201706aa0e4faf41c4617f7908a2a49ed5e1