Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1c641f3ea8afb77…

MALICIOUS

PDF

86.9 KB Created: 2021-07-03 21:42:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e7b0e85e96945e5f2d55e2809fd58b8 SHA-1: eb3bd0591576689aaa13d6be556846996aa4824f SHA-256: b1c641f3ea8afb77ae2542a60de480fd7c95fce2e1dbf5fcaa8fafa9d6bc4d25
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=stocks+in+play+scanner
    • https://mimpiindah1.com/contents//files/46591425147.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd71b6ec2b.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/82de46ad78b15c7f6ce4ab196f46fc8a/71332009630.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfca8bf0169---jarufexanat.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7d1cb6adf872e7165a74152a4052bbae/48890793778.pdf
    • https://grancom.by/upload/docs/renaxor.pdf
    • http://charivne.info/images/file/koxifuzelubirenitibiloja.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c7f12e64---72811502924.pdf
    • https://ludifrance.fr/userfiles/file/78378116697.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f02ed6978b90c2852e1ad8e62973100c/46484894209.pdf
    • http://toyotaquangninh.org/data/dulieu/files/81422989674.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/a6f0881788fd882bd346b94687e54150/ririmajipa.pdf
    • https://baoholaodong24.com/userfiles/file/74255563569.pdf
    • https://toromecanicorodeo.com/files/keneteguxesunede.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7535b221c---basotidowajujakizeba.pdf
    • https://mollis.rs//files/83678007522.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a70112d364b---78775613626.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/501fe2e8a9570914823b5cb1cf65d1fc/6386518889.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/1da1eupgfve65ctajmip5sut09/88029251086.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/37e298e6fd5c0445e27737bd9935fbb4/suzozegid.pdf
    • http://studioagronomoserragiotto.eu/userfiles/files/fodusav.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9191be094da93e7cfa86f2f63159b342/83147396162.pdf
    • 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_off0000ed7d.bin
e2562c8e2dfc2712423c7befc5c6833c95a2c4726cad6d76912c5a809c42e314
pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10648 bytes
font_01_sfnt_off00010601.bin
009875aa614c05ad9aa64e0831701e5b92981aa9b89244c39e2b3d8b892cd367
pdf-font-stream PDF embedded font (sfnt) at offset 0x10601 17940 bytes
font_02_sfnt_off00013553.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13553 16792 bytes