Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5bc67155e413b3d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-05 17:57:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9f569f1926c976fbff72d6ec9b571933 SHA-1: 0ec75a8054c905cf3a4c3613f55787bc72e69a8a SHA-256: f5bc67155e413b3dcadb67b4db004541f5590b8f8266caac4f186ca4619b78e8
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 0.9837

Heuristics 7

  • 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.
  • 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://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3bb4bde6---moziditipexuzetazize.pdf In PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/b2vcgj4a753q562tfv109nj65p/minoxojamatapofonolosas.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510045134441275uxgiwf.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/9e1fc1a983b6eb725d394d688e779b02/rugemusipojiganugesabub.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/3d5f117d410fcc6f7242b21bf0e53538/85077578195.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/naseradopokodarago.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/04f58f8f8541db0de3a11492b4448b63/46254706846.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/28892815452a80cecfc7d044f8f2ec0c/11425588824.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/11601898740.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/226931a6965a37bf4a9e53d2101b6382/revaxezimog.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/kiguxemovisafekuxekutev.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/b249587b6b0fde0b936bea6088b157bc/70099313718.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/refuresetukezipez.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc9697391d---nitikir.pdfIn PDF document text
    • https://ewt.cz/res/file/zipem.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/69774024028.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/vanugebom.pdfIn PDF document text
    • http://normel.org/files/upload/file/22792244126.pdfIn PDF document text
    • https://flomogroup.com/upload/files/nofexesokadovemomevebe.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/varifudaronijumoz.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/xogibexamibasitixosek.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/27effa9767f83b4d689dc0439fb1eba4/tivagofitefibibodatiwam.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/86069999250.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021062915091334.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f5eb41876---gemeposofonejedifilusok.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/494a8323279adf92cfdfffd745235a8f/woreroxorivet.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612aab665ebf7---14132480859.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=schumacher+battery+charger+15a+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC083 10912 bytes
SHA-256: 769e23c200cad2a3b549436f3dcbffef406abf5dbb777c611b1af69527ba6d0d
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16936 bytes
SHA-256: d1642d0f46c670ddf237e6f8646ee9c86c0628cb8277e1a98ecc3d4bf226244d
font_02_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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