Malicious PDF — malware analysis report

Static analysis result for SHA-256 1aa12435e72109f9…

MALICIOUS

PDF

80.2 KB Created: 2021-06-13 00:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 745e1a6d9a94edd44ea05beaf46a8dc8 SHA-1: eedb7422ac2a0e66d01e755c18f18955ee47551a SHA-256: 1aa12435e72109f9b32e9346ecdb2da670c3d4c441ce4f780bccfcc84285796e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'strap footing design' and authoring application details, which are likely lures to disguise the malicious intent.

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://drafthe.ru/uplcv?utm_term=strap+footing+design PDF link annotation
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/i9sb03tlnplv9qu56mu6gbbc95/71893368788.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/zuvotezakiliwasodo.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/nutatezar.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/foxigiwojusolupopudulu.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/788696ec49cb87684832d3f8b03feb8d/19122825778.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/86274874409.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/buwafuk.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160835fc3e87b9---34842148101.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/kepinoku.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/6b43d5201a2f3ef7eb36cb9ccc3d2777/tedamotoxurevezugasevatap.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/q7s038k45mb5rgo61n9pqmaoh2/vewasemezemozarum.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/a7f941310e535bfe8547bbe5668a67ee/refof.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/54230601605.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_off0000fc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6D 5280 bytes
SHA-256: c399e91e13e7b511b709d7c71da9da19c8d3385840493f5f04fe2aff6632fd0b
font_01_sfnt_off00010e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E70 11096 bytes
SHA-256: b8578e2b503994526ccbc2035a9d3804b4c5163ba89008a96edf3621198b1f89

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