Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e09c44261f0342…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 19:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a17f4f813f5840d0625378620ce8a41 SHA-1: d3850ad18ab0e529d99eb00a7b4d03d4cf0a1d95 SHA-256: c4e09c44261f0342c0fd8357020c8dd469664e9ab8348c9fcae9bef21ddd8132
196 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a remote-support lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://chcial.ru/uplcv?utm_term=combine+2+pdfs+online+free PDF link annotation
    • http://spc1991.com/ckfinder/userfiles/files/76399097265.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/26167425977.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/gulezuxike.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3807d90d---87913629577.pdfIn PDF document text
    • http://matras-devison.com/upload/file/pubuwinafe.pdfIn PDF document text
    • http://compsult.net/userfiles/file/fixanokusuvajuv.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/n2conhq0bo92fl34abujlkguc5/rufepevisuzu.pdfIn PDF document text
    • https://affordans.com/ckfinder/userfiles/files/91852932790.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/bb9mn162um6f2s9s9gen016trs/33278160899.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/selugub.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608784e042296---49854510036.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/42604832676.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a7563a93a04---36876960589.pdfIn PDF document text
    • http://erpos.sk/data/files/75712222668.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/damepafadosurukuluxomox.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/u3c46d923kub305pv42cbratl4/79954623541.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/juwita.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ce20a8d67eeab888c727d140fc5d2590/71412379653.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/zinagekanuj.pdfIn PDF document text
    • https://www.aeap.com.br/ckfinder/userfiles/files/sasoj.pdfIn PDF document text
    • 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_off0000d530.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 17360 bytes
SHA-256: f935520aa6544abdce558776b8aa6ca07f5c3ac82f8925dfed14c463fbb953d5
font_01_sfnt_off000102b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B9 10692 bytes
SHA-256: ae255e21ac4adde283c5d0fed4aa8941f98f28602bca0b644a30fa3b7d9c87aa
font_02_sfnt_off00011afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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