Malicious PDF — malware analysis report

Static analysis result for SHA-256 67b27e7b9b0c54fa…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 19:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ef2aa13c65df95f9ae738735e127b6b8 SHA-1: 8ab3516cb5738ac0a9574ecd1f60390416bc577e SHA-256: 67b27e7b9b0c54fa50840aea53f982da462178d68805fb1c4dfce03936b1a8a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous external URIs and links pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a detailed analysis of its specific content, but the overall structure and URL patterns strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=session+layer+protocols+in+osi+model PDF link annotation
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/10304696859.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/29467159911.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/sotefurapuvuvosapabudosi.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/35507469805.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/zebivuki.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/38970787661.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/66142614076.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a48a40d7---54187452441.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7960bd5ad---ziwaxe.pdfIn PDF document text
    • http://aallergy.friend-match.com/upload/files/83722195190.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/babanupitiguzomu.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/80476273763.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/rebijako.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/witisivupelakofofakos.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/jatisodir.pdfIn PDF document text
    • https://blogsma.com/files/tijetep.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/kivebamak.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/jatotabularo.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/ruwedegi.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142153cc8c37---ziganuvetuvefexewefekakax.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/firumorupufe.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/87751413729.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/30697212375.pdfIn 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://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_off0000c7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E0 10864 bytes
SHA-256: ed4bf0e1a8e6f7275b5f152ff294e2c8ffb80e8f239599dec5f4327e206265e0
font_01_sfnt_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 16828 bytes
SHA-256: a8341d0cbc8488e6133055c83a3e3ee375f4d9477a423fa253e789267fbee180
font_02_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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