Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a124efb6c1f6a30…

MALICIOUS

PDF

88.0 KB Created: 2021-08-07 07:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eb647e5f6040eeac30d2379af74f3ff SHA-1: 3c7116160830e488c4754410361078a0d483c979 SHA-256: 6a124efb6c1f6a30cc8d5e49e4f206813c8e912762640fcea2cd8e8249c71acf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests a tactic to broaden the attack surface and potentially lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://cructi.ru/uplcv?utm_term=madame+butterfly+piano+sheet+music PDF link annotation
    • http://vwtint.com/userData/board/file/zitejidibadirokenizibovag.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608620c0c25de---vilolovuzijaw.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afed052d613---59202239145.pdfIn PDF document text
    • http://aimic.com/userfiles/file/nefosozatulupotoz.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/56280806428.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/mazokikafeb.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/538787cc92986af876c2fda27613a468/manovigobulutesorapuputuj.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/vafowixoluzib.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/d7bf4fbc72b1de17661daa07c43a68c5/vujokulusijarananezizez.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/31893124382.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/begajepikekozevufege.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c11b1191c43---vedofudunoxotorawa.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/rpf716gfmbus115vd4ui1jirgf/40983103322.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae67610d135---pusixusodudusuzowi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab686a81b0---57393337743.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/ruxiruvonebibupipake.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/266oq1hgohicngnqfdrcjbim38/91845362611.pdfIn PDF document text
    • http://volkshilfe-ktn.at/images/content/files/vuzogifawepenuxunesag.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bf89e2e0b---radarovun.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d16480466---28471475311.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/pazubin.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_off0000f128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF128 17720 bytes
SHA-256: ec09caadc1d6f47e7280fa44b1aa8b587e6acf1b60230b32cc40d3137b6943e2
font_01_sfnt_off00011f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8E 11232 bytes
SHA-256: 3d52177181c541346010caf74ba662601d53aa336aaa56a60131f937526fd052
font_02_sfnt_off00013973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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