Malicious PDF — malware analysis report

Static analysis result for SHA-256 24de867ecfa78f99…

MALICIOUS

PDF

76.4 KB Created: 2021-07-29 19:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b26a5f1239b5bf619a3e15ad9f350c6e SHA-1: ed9265e75ce80998df129bfba2160145be319713 SHA-256: 24de867ecfa78f9927909b8f20096213e2f2235fc78a8d349a27e4b1857f031d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious link aggregation pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://suecoop.com/UserFiles/file/forasezuxosakifodowoxuk.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/dfbim9t7a0nnv6cf3k5shi3sna/lutefijipojavozisiju.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ollfqnk4f1fbri9aoapqhmeb90/76107033632.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6d7bbeba9---fuxijulelikogegug.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82b7a7c0c5c9719eb606348f61c2315b/mogerajiralibilakizilas.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160919f04e099f---9394013534.pdf
    • http://www.multigacos.com/admin/uploaded/fck/file/71929160710.pdf
    • http://reklamavysocina.cz/UserFiles/File/mafakuv.pdf
    • http://dzwigipoznan.pl/userfiles/file/komoweboju.pdf
    • http://nhs1980alumni.com/clients/878257/File/65043688219.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe31a57353---22241704143.pdf
    • http://yangs-ns.com/ckfinder/userfiles/files/20210528173134.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1486bbc0---65179899054.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/732a69f75eec3d8983811355987f469f/82381911774.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/ffdaae2981e829d2c5e62f9dd95cda15/xenezem.pdf
    • https://questyme.ca/userfiles/file/jalafoduranifavuvagas.pdf
    • https://fallsplat.se/file/46505910075.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9m0u5oe9i7p8o1n7h1imvf0416/24812057593.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/31848914804.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/587065ca7df14890ca3b67e9c72a6fab/52842617832.pdf
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/rolaziwipizeb.pdf
    • https://mintowncoffee.net/uploads/images/files/93443279564.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=plants+and+snails+gizmo+assessment+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c87f.bin
f19c1e0c5c810c5881c8b01537cee0d477452fbe9a4d399eaeba659e563d75c1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC87F 10736 bytes
font_01_sfnt_off0000e104.bin
a896310d97dc95cdfac81437f5f8d1813b85262290562a69c052b49edc88ad93
pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 16248 bytes
font_02_sfnt_off00010b14.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B14 16792 bytes