Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8cdce3b18cc9fe…

MALICIOUS

PDF

83.9 KB Created: 2021-09-02 23:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec4616d9729db5896d90ed82eecf874a SHA-1: be630139e0b1b3e556053e289d9eda2e27919980 SHA-256: ee8cdce3b18cc9fe696b729271acd4c83c3d02c56f60dc8b9f1988db07d3a789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL distribution suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=mycoplasma+tuberculosis+pdf PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/tozasawuv.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4193bca1---keliregunogasarowok.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16099c6647cc22---30920215.pdfIn PDF document text
    • https://folklorebridge.eu/uploads/pictures/files/voguzoni.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/78314428974.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/35973347033.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/foferexexegegavojikel.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608557b181252---posumidababuvo.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/87414862342.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d61ee76eaf---19900093096.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/2db317687320eebbe3edb972d6036caf/42023253621.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e645d53da---46860313656.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/27307768043.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f50dc035a7f---komamuboz.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/boruvazumumodovoto.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c56c439cb---zulodarunosejum.pdfIn PDF document text
    • https://derfo.info/resimler/files/takuzowebirijodelor.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/kurafutawabusopix.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/kaboxo.pdfIn PDF document text
    • https://nadamasristorante.it/file/xebilinisag.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/30292057396.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_off0000e187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE187 18132 bytes
SHA-256: cc0b8016b70893358f90315f550a32bf57fffaa063c15fa8cce0a93b5659c051
font_01_sfnt_off00011071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11071 11024 bytes
SHA-256: 0afff431396ce8d964d1d559c6e512a2b5c181427c2b3d55b1df889bb8b7a304
font_02_sfnt_off000129eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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