Malicious PDF — malware analysis report

Static analysis result for SHA-256 0233785bad569035…

MALICIOUS

PDF

88.4 KB Created: 2021-08-05 08:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7c8330cb0772e8f26fba018bb4a08273 SHA-1: 2d56c88b09e423c412074e7a220b9905bdcc1fe0 SHA-256: 0233785bad569035c7bf93cbcdbdf76184574e9483601cb8897f21d64446d9a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS upload directories or disposable hosting. The presence of JavaScript and the link farm suggest an attempt to redirect users to malicious sites or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://euro520.net/userfiles/file/162136162289137293.pdf In PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/22452621292.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2201239d451b48c2619ecc587a161dc9/44955880897.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609635d364c60---kisumarefasaluzorugubatev.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609643ab26b4a---36464202371.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/7e9df43b3567c259df7d1ce72ebbe287/53489051021.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/daxuxebazululur.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3ff242930---wazefotate.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/ligoberekofoxurosabuvufud.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/6d5866bb4b98b5a80eeaa65adc015ea3/gaviwogozamoxasotovume.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c1cd9f62f3b66ff7423603976250cead/tanijetaw.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/61805953243.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/30a3a67e9a12b5aa081da2c0f7c50423/3594967051.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843afd6ec6a---14736763736.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/99521510455.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/gitukefamos.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/ca89011b11bbf40261c49fb01bb30116/9298120591.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/91280719811.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/cd7385254654c65367777c10143a4dc0/soworuku.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/tipodizijogowupegi.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4d0177034---20755008425.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/kesolopekejuwizolezasuruf.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0ba52acae8---kolifilikikedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=who+invented+the+billiard+ball+modelPDF 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_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 17780 bytes
SHA-256: 71855b8abec7c2c69f741a61e5ea4f7241b3865adddb549eb1972fc603f53a62
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 10544 bytes
SHA-256: ee500a10610355299b0ffe14eb26b545bec788370a25a4aee0bb68b294843c33
font_02_sfnt_off00013a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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