Malicious PDF — malware analysis report

Static analysis result for SHA-256 850dab7766483142…

MALICIOUS

PDF

75.8 KB Created: 2021-07-07 11:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e0b26136cbfe583a9d8613fbcb931726 SHA-1: cdf58ad175c6b9660e6bc3bd3c8678ee8d339393 SHA-256: 850dab7766483142b4080c05df26c6627c6554c38d27e7ab9a0c7820d623b409
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and utilizing formcraft plugins for file uploads, suggest a link farm designed to redirect users. The primary attack pattern appears to be phishing or malware distribution through these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://ketchas.ru/uplcv?utm_term=class+12+chemistry+practical+notebook+pdf PDF link annotation
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e80404f3---77559982704.pdfIn PDF document text
    • http://wchs67.com/clients/f/fd/fd50fd9748f3592dabdfdad26f378f15/File/80099002478.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/86607930745.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/karobitidel.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/63351735118.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/3e3ab95385348b93286b5016bf985d9b/xedobunonenatami.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d414f6760e---15816473551.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8ba152083---59051800683.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/jivavogope.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1607faf3665d11---84295497124.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mm4dj6gv55j6d84qn6ggr5dp7e/xakaregute.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kutimemuzidedezona.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/waxovusubuziguloluriko.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/18583459659.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/18397160580.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/19666734715.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b643b117895---woguzevorepetop.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/nulugumonexirutemeg.pdfIn PDF document text
    • http://metall-press.ru/files/58686473419.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/b67c7d7aa87e99acb54d20daec15766f/84408171896.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd114d44d89---14592702732.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2a2d430116568dd060256f588e4b1578/suletozekak.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/wagexid.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_off0000c15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15B 17124 bytes
SHA-256: 593d9f15b0f9d27e9783200d4125f2b3e120ce600bb71721162441e8baf201f8
font_01_sfnt_off0000ed25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED25 11432 bytes
SHA-256: 0cde581aa567bf2e4b6d2ba05b245e4e65d9b0050577f228f63eb8644a181c67
font_02_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.