Malicious PDF — malware analysis report

Static analysis result for SHA-256 9160f63a5ca604c9…

MALICIOUS

PDF

93.0 KB Created: 2021-08-22 00:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 4f8049dd1ae4d08394b3da790dc69a2e SHA-1: fec325702a1afba8f0105fa9a236718e3e096428 SHA-256: 9160f63a5ca604c94d1494cb156d669e792ce620bbb8656569fbe7052e5fd361
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a likely phishing or malware distribution attempt, potentially delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9890

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=war+of+empire+conquest+mod+apk+1.9+06 PDF link annotation
    • http://robinsonfamilyreunion2021.com/clients/7/77/7769cd5c98d63cfb9738ae2db1c5c42c/File/604446955.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/30vij599hcc9sj3o0qc4kmrbu0/47142391710.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609c576f519d3---disonabitijufexigofeni.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/0kja7o97817dj6dcrg6f19dpub/50072214522.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/c63e3b4f2b3fe1e01cb308ae1e4c3824/3112885350.pdfIn PDF document text
    • http://ypdtools.com/ckfinder/images_store/files/sidemetijububa.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/k9l9hq57p36gmn2tvu6uv353m1/dozovesavepemoxowop.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b800a191bf4---sowenibifage.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/27985624284.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/58754115578.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/51643261530.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/18287413468.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840e116e231---pekalimonetenuniga.pdfIn PDF document text
    • http://huiking.cn/uploads/file/180131572668.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac755f405a---67109380112.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kixafibuje.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210605105244.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b2dbeaef410daeedba2d7bad05406aa2/gazipe.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/pumemeb.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/tawam.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/80375232859.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b597e638892---95412040882.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///23968325167.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160986c2ad5284---taferibufora.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887a18972d0---bipuropevovizu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7A 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_02_sfnt_off00010383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10383 11644 bytes
SHA-256: b88a3d4cfff0d2c0ac65d2ee8b6f36280cf8e4eac9448d6a9d278dca653cebc2
font_03_sfnt_off00011efc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFC 17836 bytes
SHA-256: e834e0bc8440b76aa1556927800581da912b690c9699c72025b0b7357c0b7b45
font_04_sfnt_off00014c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C71 16488 bytes
SHA-256: ed01fa4be311ccdaa7b4fbaac36cff2e574c337140c7d3aba217c961eba1e7f3

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