Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0103751fc668302…

MALICIOUS

PDF

73.5 KB Created: 2021-09-12 22:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 67ed6490ce4ed05b29d428c4c3112da0 SHA-1: 130c159a9893ae581b30cf4f870e72b673de7168 SHA-256: f0103751fc668302023bb9505219dfa4b1d9900ac888bab95f2a2acbc9f73f8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and presents a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. The embedded JavaScript likely attempts to exploit vulnerabilities or redirect the user to malicious sites, contributing to a phishing or credential harvesting attack. The presence of multiple compromised CMS upload links suggests an attempt to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eca.or.th/ckfinder/userfiles/files/jexewipupilogu.pdf In PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305a44632d7---4659707570.pdfIn PDF document text
    • https://designsdubaiukfashion.com/userfiles/file/fixedubiraturidito.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/rpbmn1udt6gi8uop6hsu5558ij/44827292336.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/sexefepilogewudunajudi.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161318e94de579---levuwobululoperuguwove.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/zuzajobiburo.pdfIn PDF document text
    • https://waxparadise.pl/userfiles/file/juwatowojivibebaxixugi.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/xojupofegalesis.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3c76114a8---68679619271.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/65668102920.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/modina.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/vaxag.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613821a97808d---kesokan.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/nerasakolidetu.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/zexulim.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210903_D051E0EDBDB78D2C.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/misurado.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad51c67f13---51868111221.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/zetejatukorefiguvugolina.pdfIn PDF document text
    • http://djapm.com/userfiles/file/wetenobimiparaxap.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f149b27f5---54277378357.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161315250ae7e3---lakufabubirovizej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=online+movie+app+namePDF 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_off0000bf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD751 16732 bytes
SHA-256: 02b9e95aba0a3fa8d47fcc6e3a4150190fe8639ff470b385280fe4fd2840be14
font_02_sfnt_off00010245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10245 10140 bytes
SHA-256: 46a877a03f73d59143b1241e2dfc2cbc8ab9d630beb9339f35e2820b117fa333

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