Malicious PDF — malware analysis report

Static analysis result for SHA-256 21c34b48ee177eb7…

MALICIOUS

PDF

75.2 KB Created: 2021-06-30 04:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: cf5c2ad135b7035d4c3ded409a942a4b SHA-1: 5718f4ec82ef417df2de078d053e3b68dd989f43 SHA-256: 21c34b48ee177eb71a87d435e2f3d032cfa776e532ab64f07adf7c56b286470f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as malicious and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of embedded links, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent, likely to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://rsun.pro/admin/ckfinder/userfiles/files/figafolepid.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc349ac544---mefaredobexefaguzesupeda.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fef58ab88a---jiwumiwijisipobazamajux.pdfIn PDF document text
    • https://artenika.pl/fck/file/liledur.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab3cdc011e---26283644976.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/24124240391.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091bd7bca895---25212662817.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/96043308960.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b44193736ec---81494974232.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607312f8f39a5---15585086730.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/01072c7480f3adfab9c6d6058117f350/62929784445.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/56013446775.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c79f19ea08---jofud.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/44533592148.pdfIn PDF document text
    • http://ithaca1961.com/clients/875375/File/sakilatikebivetenafewo.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8064c00200---6732180182.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/09252d3f5f48f2cc8ac5358479ea41ea/defivodalokoser.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/lasetuzodi.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/10721880403.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/70798230781.pdfIn PDF document text
    • http://www.siposferenc.hu/html/52635939577.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160976727ba3d3---tomejazejejevobipaze.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b355e57cd2---tanapemiribikepupimugawa.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/50458766599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=hanuman+bahuk+pdf+with+meaningPDF 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_off0000c6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF11 14988 bytes
SHA-256: d7aad48563ffb7b235a2752f39e8cbc1fc2ec1631001f45e3e3b86f7b93f419b
font_02_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10920 bytes
SHA-256: 1b65683106c5529d1f887da1f22c9781730c5096b3bf21485502045fa5b199c5

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