Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8185e40deebe850…

MALICIOUS

PDF

80.7 KB Created: 2021-08-01 05:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1a7c9e7630660866535c0d62c41873ef SHA-1: 839e3b898b3dfdceb43e514207ad45f2763f5b1a SHA-256: a8185e40deebe85042f4d52499e4c87e69815a4f8478b31836f1167ef0daf42f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised CMS uploads, designed to redirect users to external sites. The presence of a link farm on disposable hosting further indicates a malicious intent to obscure the final destination and potentially distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/87885a663c8e68cf1b1232d37e032697/zedukisivumamobofipuripad.pdf In PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/jenilejefamujetuzabobuse.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/1461028692.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/12940643909.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928f2ce3840---vevimuga.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ad29c96---46575837573.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22fb42bae---lumavapavetisigelaf.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6c032933fc02cd8a1af19262c5f6eec3/gekadigarebefonepasumil.pdfIn PDF document text
    • https://bursac.net/userfiles/file/13036274499.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/rirc59e0r3pfdq8potkqav7tsu/wuxeloworalusagipigefa.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdb6b5641---19332744471.pdfIn PDF document text
    • http://computerdoki.hu/user/file/41217090263.pdfIn PDF document text
    • https://seripin.com/calisma2/files/uploads/tirobisaxivekuxaxifepaf.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/dic8rbv0dn79n0donmjot2oq93/66394426356.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3a3993c9d---jodupifumojovajoma.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/sifigatotuzusimolak.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1610500c400dc3---muganuvorefowemed.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-12/20210512025257738064.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210615164940.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d17d9b0ad2---41590682499.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/59002732878.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/bavalapurusixawejoluvosap.pdfIn PDF document text
    • http://tao-ssct.org/data/upload/file/poniti.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/363b8cpsvrc5dljn6l32088c1h/35503393505.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9c4f18b3c5b3829fc309435442f58825/11585515629.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=uniforme+del+am%C3%A9rica+para+dream+league+soccer+2016PDF link annotation
    • 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_off0000cfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E9 11588 bytes
SHA-256: bc0e5bb9e46e4bfa3cb3891d21d71278a0a9202656a524cee08a2ef3fdb8268b
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 18040 bytes
SHA-256: 1a0f5a715311f987d9b3e8f695a85b87497d1d76eefe785747e5f3fadf364c99

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