Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c7669d2cdbf2eeb…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 21:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6e1001de782d86ffc73a815aef710e4c SHA-1: b8ce9e43788dca7118bd4c23f8d6306fb38283df SHA-256: 9c7669d2cdbf2eeba7a4145d46d2286d992ad1b1afa903dfbc9d7d2a824eba65
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=terraria+apk+free PDF link annotation
    • http://capesociety.ca/uploads/files/ramogirofot.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c344aec5ff---janijazan.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfae679308---gukejevixufovigota.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kekutirofuxupevozoxu.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/50077564430.pdfIn PDF document text
    • http://wingmanplanningdemo.com/userfiles/files/43170941785.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161339dd5ef812---vigenivitenetidemawap.pdfIn PDF document text
    • http://drironcat.com/images/file/jegajijesate.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com/ckfinder/userfiles/files/sulol.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/31324611894.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/woseterituwukiruxisi.pdfIn PDF document text
    • http://geotersrl.it/file/bobuwoveri.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/40719443016.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/fawavog.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/38449019224.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/38952384340.pdfIn PDF document text
    • http://assisdrive.pt/userfiles/file/zirakofabidusamosamazusa.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/17468308506.pdfIn PDF document text
    • http://kanomax-nsk.ru/images/tazododutudodinem.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/balexife.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/pejolu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/98233128353.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6af797ba6---farijezixogi.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/10852365093.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/65054195601.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/36949652853.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_off0000dda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 9872 bytes
SHA-256: 8838ec55b9ccafa88e4bfc438fd46498639c20c0db662c38b66e8839d61b6036
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16428 bytes
SHA-256: b265251250b85bf190ae5032ed335e884f42c7047692a1874290bebd54e256b3
font_02_sfnt_off00011df4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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