Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdad0508b52b1a1…

MALICIOUS

PDF

86.5 KB Created: 2021-07-10 13:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: fe1ae951c69b0b36f5f6686c71a3755b SHA-1: 58ef3454c5cf009d661ad70e90ee02c9c3a780c6 SHA-256: 0cdad0508b52b1a1c4407bfcdde6483a44143f212bb0c872a7175a5b1f315bee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc449d175---75652700786.pdf In PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210626074729.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e4e8d9c44---gijebat.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606e68f56f345---zirejuvibojumilak.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/duwubexuzidodaforulaj.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071a1d38a370---wedezojuvojegoregi.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893bf382d3---20824635793.pdfIn PDF document text
    • http://glina-master.ru/admin/ckfinder/userfiles/files/82011508804.pdfIn PDF document text
    • https://soechi.net/userfiles/file/23158636721.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/nazuwuj.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/17080748840.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8e8877ec83---9337713972.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e1fb1cf74---siwukotisaxufekuvoneranep.pdfIn PDF document text
    • http://centronegozi.com/public/12891908152.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/94a44mn2v5bbrqkidjk40nniea/72933468795.pdfIn PDF document text
    • http://tulsamemorialclassof71.com/clients/84987/File/66156516265.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zewoku.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/9pkrl6cvbrkvdpni8ar54kijm5/muvinidaki.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a700f3af2f4---ruxinulate.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66a02d390---59768027395.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160841a826eac8---papog.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d262a3135---76159426074.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/86d4d88664bcc036b30cf07884fc065b/7691593938.pdfIn PDF document text
    • http://infunplastic.com/d/files/90381238454.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/16466164840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=download+chapters+interactive+stories+mod+apkPDF 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_off0000ece8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE8 17404 bytes
SHA-256: 014d71683a1f7c4130c93397ea3e2a9d35c369a4f72d5c3ff4fcdad3eabc9e37
font_01_sfnt_off00011aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C0 11024 bytes
SHA-256: 826765cf8e43c25968119349b6e5db03b80238f69bfcfa2e3a013a6cfa4b5e44