Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeb8552e5e076e1…

MALICIOUS

PDF

115.9 KB Created: 2021-08-09 04:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: eda2661e7b7735a7d69f2506467f22ad SHA-1: 7feccdae333bc09adee67246fff2535510e05e6c SHA-256: cdeb8552e5e076e1b79e4156f03472aedffd1962d552a4b78c47a8c061818fdf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. 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 0.9842

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://photou.cc//ckfinder/userfiles/files/49770042345.pdf In PDF document text
    • https://glycocalyx.nl/userfiles/image/file/90824538036.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/13574408798.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/36852559990.pdfIn PDF document text
    • http://grapevinewinerytrail.com/clients/876125/File/bulifusop.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/bejemezenozowozixeri.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/12385639813.pdfIn PDF document text
    • http://abpaluso.com/upload/file/zikal.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/80002388470.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fe9297c8a3efc8053ae3331fa82fbd2c/5244663918.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a253e1f8e---30233377482.pdfIn PDF document text
    • http://palami.by/images/file/lixovotepugakisibelune.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/05jjgep50qeucr737b7e9plfv1/62764218102.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609561a9b1240---dolezatowipogiserob.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca6996247---50555951255.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dfb6da8f5---fewabeguk.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec504b46bb2---47679547618.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/a1501663b96d5e83f2db7d76d45d9000/86455849656.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da7be4e3b6---memawuduzen.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c66f48503---likexesorujezugipa.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/83964632236.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b4167b19175---9535582664.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098a3bba0972---39612210414.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/ruvatokakevaluvowi.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607717eab2833---joradobowakiropuvelorasu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/a5866aad9bda8fe91575e79c82c74507/dufekujofidej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=assassin%27s+creed+3+save+game+location+rg+mechanicsPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001338f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1338F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014b9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B9D 12280 bytes
SHA-256: af6a8c10abb4a341438fbdd7599c47968a68245e98db16d17943af37e409eb86
font_02_sfnt_off00017137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17137 20140 bytes
SHA-256: 20b2fcbd18a2659856c068beda3307204e4713b2bf1b355431d2327aec062d85
font_03_sfnt_off0001a6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6EC 11072 bytes
SHA-256: def4353ec94984e513e9703a4faa68bbde1b176377c993d3a7cdb583c89b7f28

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