Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ed99ce845e5e42…

MALICIOUS

PDF

88.3 KB Created: 2021-07-25 22:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d614a56e85c6328e1964522dc71cca5f SHA-1: 324c9db57766b848ad103290b8f397412e1477f0 SHA-256: e1ed99ce845e5e42ed30d9f2117bdca1549d2fbe2d23b7038717892ba4ded77b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are designed to lure users into downloading malicious files or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a45a2ce59---josezumidakafezutasoli.pdf In PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a3ec9a07---nuwubodivotusuvi.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ceda365d3fe7d02e4457532500982291/99998278730.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7eeadc7db---nuzetovelex.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40535692240.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/mojobedolipavu.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/b8h3lc1kim6a1mc0c722ch356m/62495265055.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607070c4db727---30466313945.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/bf4c7c9acef4fbb14859c2ec187c5a63/64565860775.pdfIn PDF document text
    • https://robertbah.si/files/file/73322298825.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/pokabufer.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/82422024025.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/sonaxizurimubuwabezaralas.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6036720f15956fa74c4e646c02d375a3/zivabedamix.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/3418820378.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/080824474386.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2947107e---15712816062.pdfIn PDF document text
    • http://ezibra.pl/upload//file/jinozujemup.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/tefupopebosatokogopanebup.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/rebonikomar.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab2daa81e---jitazejigiso.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ea11d6dea68bab8e89b19d4b7c9b2bc1/94830376423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=adobe+creative+cloud+packager+2020PDF 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_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 11040 bytes
SHA-256: 85561f17f42b28286d3ec757acc6db482a4e3c91e10ae8bea4250d0a529f446d
font_01_sfnt_off00010ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD5 19172 bytes
SHA-256: 1332b009cea96b7ca0faa90e32cb79a53255bc8a630de103495728466539a748
font_02_sfnt_off00013b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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