Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0555932d81afb2e…

MALICIOUS

PDF

90.0 KB Created: 2021-08-16 06:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5f024f8909122aa115afb33367ee532a SHA-1: 307b210c98ef07885bcba26b064df87831ddeedf SHA-256: f0555932d81afb2ed3e6f5b1aca90478d5c6c6a57256ad398a53c237eb8a10a2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic findings are sufficient to assess the attack 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 https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bcb3ae32a1---tokurimowuwujutexekazut.pdf
    • http://robwalker.net/fckupload/file/86092107401.pdf
    • http://studiozammuner.eu/userfiles/files/70665370389.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/j51ct7c1jnm69rfdlmm8kn7lll/58625908027.pdf
    • https://focaccellini.it/file/dufiropuvexinajib.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9be0fa70a2---73344377071.pdf
    • http://antoniolescio.net/userfiles/files/74521309697.pdf
    • http://bestapp4u.com/admin/uploadedfiles/file/xitufupebumuripope.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/957b09ca241208a377e92a58ee482bf9/70262240364.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5468534c---kusisuxezera.pdf
    • http://euro-ex.com/39716182968.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/52841739056.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608289b43824d---tibasalotiv.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160719a503b272---pasudolusosirixozipemuto.pdf
    • https://jetaime-shop.com/files/47313535838.pdf
    • http://fullx.net/files/feluzok.pdf
    • http://thehigh86.com/clients/13680/File/lojekobazepitu.pdf
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/mifunalewun.pdf
    • http://digivideos.net/ckfinder/userfiles/files/19240191807.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a64d19897aa095237ca2ff37f97352c0/23694326163.pdf
    • http://bluecars.pl/userfiles/file/75804319152.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=download+lagu+sonia+full+album+rar
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000112d4.bin
324eb2976ece47f81a106d63bed40911957730693e012e915c7002966ed773be
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x112D4 18260 bytes
font_00_sfnt_off0000e224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 16792 bytes
font_01_sfnt_off0000fa3b.bin
63faa1642651c1d44ec46abf4d190a78ae0de0edafe54f0495d7c85acdf84806
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3B 10792 bytes
font_03_sfnt_off00012f40.bin
cde15f3b113c3beb8e1ee47907a9ca15ca036cd8d4978ab6495100d43194faf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F40 16552 bytes