Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dd18f0b1ebf206…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 23:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: af9e5562e96f2a374a9fea4aac0a2687 SHA-1: 39964cf1d8960d7cd772bf3ab6d4cec49f59def5 SHA-256: 84dd18f0b1ebf206edac17f6bfae46c16cf792beee14904d8ca47563830dd025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=bully+anniversary+edition+unlimited+money PDF link annotation
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/safefasidosulunigofidekiw.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/63543677272.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/83489546382.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/mokosabevawiwewatines.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nonuponikowexepuderif.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/momugonagumopaxuvavu.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/35780041146.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021090618282873499.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/vobunukerodotorel.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/jikufoxelerufikagelezoniw.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/turikirisanivowuregiv.pdfIn PDF document text
    • http://seowonbattery.com/files/fckeditor/file/17986378456131664e7658b.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/zivafoxikaxuvuzemelewuvis.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/58633844284.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/dexugigumazap.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d86d2af408---32752545149.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gakuzakedexokirawegokudul.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/68338319907.pdfIn PDF document text
    • https://promoform.coreform.it/uploads/file/gilaxodijitisaf.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/viragawolemizusomopup.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614c6c671a6e9---lidusek.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/poxibokobotebup.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/84374654612.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/91149983075.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/90b74b08a7dd7f1e535dfe1787eed12d/tufosuroxidesude.pdfIn PDF document text
    • http://tarp.longi.tw/uploadfiles/9890689311.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_off0000b645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB645 15488 bytes
SHA-256: de1c299ea34495bc833b223e1cd8a775b46a69bdb89336bccfc84bd219d2ca3d
font_01_sfnt_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 10740 bytes
SHA-256: 9e3bcf7c0499937b09d3b79d6c3b569c1fc02a828b58345ef910828b45515621
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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