Malicious PDF — malware analysis report

Static analysis result for SHA-256 85d5c76c3785bfa3…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 21:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5b1d2411bc79e8a8b2d32188035d087 SHA-1: 5c3bb5bf66c5df071efacdf46bc20b54bc2a1586 SHA-256: 85d5c76c3785bfa324b5a5db09fd9a4f2cb517cdfe4c2410ef2c520ef5815ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070094219661---fozovofeno.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da8f29e790---nuzovedosezenaro.pdf
    • https://workinhotel.com/upload/fckfile/dopiramaxiguzelew.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e821ea0cb---89305633415.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/ae2114edc9a2d4b8bb4d451652813edb/37443859805.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba46de73c78---70328543154.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608275c69b788---47884949098.pdf
    • http://polipack.ru/content/file/tipexilurazarutop.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca7e0cfe95---pepetojipudixisivamaz.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d106cb5cbe---piwivomenogelesuxilugop.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/1198a4c3e04bdd082b092afaf757aad6/vitaxoturibisebemuzal.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071133b9911a---wodovonolukegutetotegoj.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/abe25c2a7ab0d3d85b7eb726a86981cf/88463844531.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080ddcea616f---75536017480.pdf
    • https://systematix.pl/userfiles/file/97686297567.pdf
    • http://jjmcp.jp/userfiles/Image/file/28070557124.pdf
    • http://annandale1963.com/clients/69704/File/desesekulafesefup.pdf
    • http://pogservice.ru/userfiles/file/82778510144.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a597bf716---23433729964.pdf
    • http://sequirk.ie/userfiles/file/petepiful.pdf
    • http://wib24-admin.de/uploads/file/bojiramoragizizeli.pdf
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a7b37f1b865dece6327dbb2e8fe740e/labanika.pdf
    • https://northcoteplaza.com/userfiles/file/58798735792.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=game+of+sultan+cheat
    • 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_off0000fb8a.bin
f5f6078d25640d390e424a7f1705bc3c74688b59e3cf5807ee7a1e429a750ab0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8A 10548 bytes
font_01_sfnt_off00011373.bin
f59dc1975c23955c60874b553bb7a274e468fa26a60ecfa561afec7053fcb83b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11373 17932 bytes
font_02_sfnt_off00014252.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14252 16792 bytes