Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d816590480eb299…

MALICIOUS

PDF

76.9 KB Created: 2021-06-18 07:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76fa8630dd934036be3e48d4ba16a4d5 SHA-1: 3a9969ef89037bcc4eeda685b11b44d3489d671a SHA-256: 3d816590480eb2990049997592c04c14b2910bae7ab49404294e763e9b061b40
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS upload storage. While no scripts were directly extracted, the PDF structure and its nature as a link farm suggest it is designed to redirect users to malicious sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/2vfm73ku04s4io1hl4ip9agfv4/89610219401.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/aplfkl26s0j6jh6h56bek54ova/90569263045.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b485c1b6180---moredanane.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095577ca251d---vadowesupebuvu.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/91411841853.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd0c2626ae---manunod.pdf
    • http://seoulsquare.com/userfiles/file/35780829789.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dab8beb26d---godozabivofeno.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079765b9d2b9---31573124931.pdf
    • http://szentimresiklos.hu/upload/file/33907347306.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7df23ffd7---jinif.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75bc14f33---debagovibemofezi.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbaaa4347b---sesixiwajoziloke.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/b4f0cf2ee6929c09f9f7019c279902eb/zexusofemifojidemipuj.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6caad96d---vemofukowivimotejewejo.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/feb0104ef4bd066bc3171b4089943194/tufusara.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843f6575d9b---4165663636.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dino+world+mod+apk+unlimited+money
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3f1.bin
ac64b8af80fcca1e0e594fba8a0f1e66fdecb42d42f059741c9e9f76428d751e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F1 2880 bytes
font_01_sfnt_off0000ee30.bin
0c4c0c4065b046d0b2ba322de097bc907c48c810554bcd6edc57c872aad0c6ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE30 5184 bytes
font_02_sfnt_off0000ffd6.bin
4f610c409d30a407cfdafc115c2b5d902a0e04ee9d9c72e9f750cc7d011b9de9
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 11136 bytes