Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aa983730aa55b8…

MALICIOUS

PDF

81.8 KB Created: 2021-09-02 09:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 89214d690fe8bf3d30be5e82b44081e1 SHA-1: 2a1944a5aef5b9d9bcaec92ec29e0b2a317a6943 SHA-256: 39aa983730aa55b817d93ae60dc3fe5350a50197028a39f819eda42ef46ec7d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=target+cyber+attack+2013 PDF link annotation
    • http://pampa.be/uploads/userfiles/files/59373588906.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/86389980078.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/62771239327.pdfIn PDF document text
    • http://edison76.com/clients/5/54/54c13950cbd15a81e6fb4362eab8f273/File/39414655767.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/4402756737.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f3cd4940a---61527497160.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/gesafubijujitaboduvumose.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/ritilopojufa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c74eb56c24b---17169438037.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/a303714d397b0a9f15180e1e161fe2d5/78289808315.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/6397e18f1bb7184a03c692ef231976e3/lamiwitowegeletorunupi.pdfIn PDF document text
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/xeboduras.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/jipizedeguzotaxonipo.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/65136227709.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987201dc39---momasenonavewasagovesub.pdfIn PDF document text
    • https://dineflon.com//files/vamupukala.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/48983987950.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a26912a1a0b---73098102682.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/96852287299.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/toduroruwabimirutox.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/mudibufe.pdfIn PDF document text
    • http://qkmedica.com/uploads/userfiles/file/94383168212.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/96117755879.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/4632637823.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/51fc2d355795a234be3acf520277d337/panakaxubupufu.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_off0000db06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB06 17688 bytes
SHA-256: 27b04bb7403aec24700278dd410599979837f010cf650db0990a9113e91d2a5b
font_01_sfnt_off00010897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10897 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AE 10652 bytes
SHA-256: e7be84b1de205476708d2b58e1292673d68732515de92d68d9f5ff9f8bc803fc

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