Malicious PDF — malware analysis report

Static analysis result for SHA-256 9921e2aac499b03c…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 19:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 494df28e32e308211d5def43ca23d089 SHA-1: 311d8196436a9588616eea30e77656144644d3dd SHA-256: 9921e2aac499b03c9f37e9d2b594cc0ba86d5e5bdcea1dc7a9fc6c8cfda9941c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting it's designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://gagiongvitgiong.com/ckfinder/userfiles/files/59596336345.pdf In PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/22a7082e03067e8507d704f13af26159/1256812078.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/237275580.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086356023918---gufetozurawabixativoluze.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/efnvumjt44grscttpurt8rovs0/xugebimowed.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/wokonus.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/5391026773.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/3920649843.pdfIn PDF document text
    • https://krone-murten.ch/userfiles/files/rewufugutejunufax.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/b15abd3a8fab041a1e34428d8fccf362/kinusumatumivulogizunalor.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/48025799892.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/xunexax.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/54708103844.pdfIn PDF document text
    • http://hzqzg.com/d/files/jelomojigib.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/68455679352.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/vujewufedupowu.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/29925033687.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/35625845540.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079de27088ec---zalibexavigokiduxug.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/62fd2695e14f7ddaf6e91447a56f2e7d/dokasuzugumeposodika.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/48934678748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=november+9th+book+pdfPDF 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_off0000db0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10636 bytes
SHA-256: b64a79c65dd662d9c29d39b2ba1f6da8797d575f5a2cdea31f3105d4ad2e77f2
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 18068 bytes
SHA-256: f03579548552b687b6bbf4ad5a914c7a7c1b5fd440f74d36a663da949893d311