Malicious PDF — malware analysis report

Static analysis result for SHA-256 849118878ad5ee4b…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 23:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 78f6dc42bdf35991c79f823721ede9ac SHA-1: dff39c1e1e13d9ee44cf704dff9082a8128e3da8 SHA-256: 849118878ad5ee4b2b132b73d255a1cca90b1f6703c7e5e2ad1b7ff9b9b04649
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis point to a malicious document used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://medvor.ru/uplcv?utm_term=reaksi+kimia+fermentasi+yoghurt+pdf PDF link annotation
    • http://supermarketdv.ru/files/file/37966749782.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/98295613736.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/58260978321.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160735dc402010---76233877377.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/7q62o45q8e0csmhjnn7eeef3m6/wesemegixiwuwesewi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ieah6flo091q9scqhhmkbkfcj6/zakelolifovafopujava.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/96904a0a5a26fd8e27ed82397dcbe388/kokim.pdfIn PDF document text
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/6d5d93daafe2a7a71f35b21d8b244660/23923940853.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/26393388864.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/3f94dddc31a4997c3331d134fc8398de/ruboro.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/2466847086.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/tadovusovor.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/d9ac77387a36dbe04729cc8b5d9a3bea/83099083991.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/letavolikeva.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/43fb304c5baf0020e6b406ab2e6da883/tivesesidigunakutot.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/q6su6auf95b5opckm1g0lank70/4452441966.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/ecc117e62f61386dc245faf8ad26c7c9/23554819191.pdfIn PDF document text
    • http://veivel.com/userfiles/file/fisonilo.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a5ac8025a---88205352384.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fa84faa0---12704054167.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rtsda6dlbnhpsc9f85n0d90von/49531341914.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d09f142d---webadesaf.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_off0000cb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4F 11252 bytes
SHA-256: 619536dd54f4c3a1ab0cd8fdc9e30bb379517c91c3ecb9c984f0173a709af785
font_01_sfnt_off0000e552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE552 17348 bytes
SHA-256: c394173ce62c8a22a2cc81da0dfcb7ac9c73e8618d9214db9d3f1c3c274168c4
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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