Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd5866f1fafc679…

MALICIOUS

PDF

110.9 KB Created: 2021-07-08 11:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d99a7b3dd1d863416506f9b165ddde6 SHA-1: 174f9f8bb46c08c2bb238c87e615e71270c800b3 SHA-256: 1dd5866f1fafc679457031424922046f90e2b00b137e295ac60e5d927f665cc4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL targets are indicative of a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/7929254910.pdf In PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/29618899166.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/zazemezepe.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/73784874512.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705fe2b5e8e---14865583168.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fb57a00fe---21049803775.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/25865531598.pdfIn PDF document text
    • http://spearsyounglegacy.com/clients/b/b2/b2c23f164518415ec8f3c1c8d0af542d/File/8406350758.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/nimijawasokekoxopaduw.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aae9e1b9ec6---2901859071.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2199nn4u6io9a85pgs7i6pav50/wopekurexotapapudakelux.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/b3a5d11cab0f34920ddf6e4fc4c1bff5/43379338751.pdfIn PDF document text
    • https://la-klamm.org/Files/files/61820705204.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa210301c---54230148169.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/a0dc25fcd8fa9435c7f17f433bcbc988/suwegetafikup.pdfIn PDF document text
    • http://stylekd.ru/files/pizagileberutoriwe.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609579241777a---bezusejudurekuxenuk.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4d201d9a---52146702465.pdfIn PDF document text
    • http://aklond.com/UploadFilesfile///2021070710555769.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940c8b5ec16---bivigaxudoxajaz.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/varofejonenelafoginof.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5516b9401acfe5e1f626f2562dc320e/22074980378.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b30dcf5c3f4---97876610534.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=captions+for+guysPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B4 17752 bytes
SHA-256: 3863be5de34a955b00dcf7def66703d350207ed5a8fd6520596201cd17cb9edc
font_01_sfnt_off000163d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BE7 17552 bytes
SHA-256: 29cd9c72480200e1a451ff6454bdc6a8aa45f1b0e8a13535a0c3df44bde1ed38
font_03_sfnt_off000195ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195CE 10600 bytes
SHA-256: 6d537f0e5b03e98e32bcef3e774b988f7db9474f20d3d25fec94d8fbc6a37155

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