Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cf131c6b9106af…

MALICIOUS

PDF

136.7 KB Created: 2021-08-09 10:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2deda52350d2d3f4ff0892b041b7948 SHA-1: 86b5f6482c3e7fd4a543468c3a138c024f664baa SHA-256: 64cf131c6b9106af78b4f4195ca9442e87029c89ea8f497db652e552c605fa64
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful sites. The presence of 'utm_term' parameters in some URLs indicates an attempt to track user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://crysiq.ru/uplcv?utm_term=ovid+metamorphoses+book+3+bacchus+pdf PDF link annotation
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d45f8dd6da4---jowubujurewi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ffeec2fb0d33bcc30d9c93fbeb32a16d/sejozerekew.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/22172970622.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/vulewatesamiwiwofimugepat.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/bubumoxogekukagubedazujaz.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/6smrpo112tst0k6re7c5npdglt/5242600726.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/17092166072.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c45d2612c52---35305553180.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d05f3d9e3b8---jogumu.pdfIn PDF document text
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f1d3041---tidakuwoxubuxejodof.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6c35538205fd38f4d7f19559296c091b/45544273342.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bab13e4ae---nebewusogizoli.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rp6m11fecc8jq7d9bj516nc8t6/xetaw.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/31663952855.pdfIn PDF document text
    • http://hferrynetworks.com/FileData/ckfinder/files/20210719_838FB4347DC7C174.pdfIn PDF document text
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/89597920419.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dec0ee46d7---rofusopubiboledifu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d2affa3b951---67618449343.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/kiwexuwiditabexotifubipa.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abd91659bf7---88962149702.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/7838c0a035c702a5cb5a9d62e8059ec7/doviketunin.pdfIn PDF document text
    • http://virtuozi.ru/sites/all/sites/virtuozi.ru/files/97884064353.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/q8ene9qcl7noek6c3p4sm0obv4/felazej.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001be53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BE53 24500 bytes
SHA-256: 698ba8691df5cd714c56f6f3b8d4aa0fbf07e79342d04a43f650054fa354590f
font_02_sfnt_off0001f9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9C5 11328 bytes
SHA-256: 5d338dbffab8161b8b898174f90a763aeda63f2be820a83041432519ca75c140

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