Malicious PDF — malware analysis report

Static analysis result for SHA-256 3580797e84a8e723…

MALICIOUS

PDF

80.2 KB Created: 2021-06-10 04:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1cd349d516398b202098d26060fe174c SHA-1: aaac0abef609ab1525a49abed3644bb24e4f1312 SHA-256: 3580797e84a8e723081d2e25d394b03100ae34f330de9f9fce1536de33f4832b
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The document body, though heavily obfuscated, suggests a lure related to a .NET Framework installer. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://archism.ru/uplcv?utm_term=dot+net+framework+4.5+full+offline+installer PDF link annotation
    • https://premium-house.uz/images/file/xawotaniji.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/87187542206.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5cd5431ae---48714823439.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bec324741---37137618803.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/8nj90a88d5j907ihkice2cgv6a/povisoko.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/zejerojomunepejiwobuw.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608975ee9af97---nuxilape.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xufukepoj.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/36867280838.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/654ca43233c3829c50fd65b96c149011/terekezupenituvolivuxuf.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/ufi4tq6bivu8q5sgsf5lh7kve7/34830203229.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/53692815838.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc32ee0eee3---95929627015.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608358d915f3c---63423033163.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qh1haabppv95dkbabj4n0qi2ju/kejididi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 5312 bytes
SHA-256: 01ccc7c780e024c754ab6127f1efa5310af850b9a54309ea82fca6ecaaa003c6
font_01_sfnt_off0000fcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC5 22508 bytes
SHA-256: b83fdb41b6833d865a331553ea1450639c742fbb6ed33dcce692703fa133ec30

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