Malicious PDF — malware analysis report

Static analysis result for SHA-256 211bef0c5c823bf7…

MALICIOUS

PDF

86.8 KB Created: 2021-08-02 19:00:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6b33cd09a488a8ad1f5b2e0d77ed2915 SHA-1: bb4018dc6afe4678c81650659c5be0d45d0d56d1 SHA-256: 211bef0c5c823bf721c9bdf68bb2418f73a8b0b9f112f3788158f366bf286d18
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload storage and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.dawnrotaryclub.tw/UserFiles/files/sidejolomowisizivi.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608564598f5f4---tubobogirakidopifuxe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/030379fdd6c4dc30e8369fdc3b91e718/45178569050.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fb3401868---20229429329.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/24cc098a3f6bcd980f9ef4ad3b93bcc9/9983865508.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/75689882072.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/zuruvita.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa056d8ef4---55777905220.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e974786f3632c5c18482072b7b92b651/lutusuket.pdfIn PDF document text
    • http://vkts.se/userfiles/file/zokugakiba.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/zoxoveb.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/sefobabib.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/noronisegoxosatuj.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/gadiwovawosekulutosu.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/39599402396.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5ab14343d---gubosutivugogorumil.pdfIn PDF document text
    • http://kaies.net/upfiles/file/wepitedaxibaluwam.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7fa9485da---tazalu.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7e13ebe06f7cde5f326f835f2c32b101/welukulomilozijowu.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/rumukumogemupebafamex.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607fae20bd073---gerixi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f09ece7a8---wovunumobolaxesiz.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e22d715d92b---simazijasipujeromixigux.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/2983103222.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/95776528511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=exterior+angles+of+triangles+worksheet+answer+keyPDF 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_off0000ee8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8D 17060 bytes
SHA-256: f2dabade839b26b10af55c7207824ea386b9ed031e963f2acd7b1f1a293e6a6a
font_01_sfnt_off00011b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 10868 bytes
SHA-256: 9d19cf374dc278b4075cf36100f3656eedb0b33a662ef8473a2f11da2bc7419f

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