Malicious PDF — malware analysis report

Static analysis result for SHA-256 7290624f4acd0710…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 06:01:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8eb3e24d84c8f1e321140532facec94e SHA-1: 02da64f28ec12dd609db9fab87ef6aad4a7b6a2b SHA-256: 7290624f4acd071028c0850754bb0fad01dbe9f0824a3f9b8e00712f0082a115
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://jkmart.net/FCKFiles/File/pujafidoneminafaku.pdf In PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/xagexif.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/49612948519.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5221140f---92614813388.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/28123291506.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210912_5E2D287AE5688C1D.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/mcpo0kvhn8rk4sgvlcu4gbekfu/diniziwavajakemi.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/cf72ae120cdfbf4cbce3da9e63515be2/folamakomi.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/39628794666.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/lizitogemubes.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/sesofilanasa.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/duzibudutesapavojiji.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/72806486238.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f326285909---tanokokelapamapekedilexi.pdfIn PDF document text
    • http://wernitznigg.at/files/titodebevifa.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/74152744069.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/2810895862.pdfIn PDF document text
    • http://narzedziascierne.eu/Upload/file/baxokugokavid.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/vbh0i356tuo97mg1bbhv5r8d24/4923124062.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/87753778315.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/19473109739.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161507047df40b---70294507003.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/69811855063.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/famivenofesisew.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/49580620790.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/30391506905.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210901050338815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+code+to+record+phone+callsPDF 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_off0000b73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB73A 10592 bytes
SHA-256: 9104974b291c7955720b49dbc615f31d6161d7afbdec76ab3af22ec96352d305
font_01_sfnt_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 15968 bytes
SHA-256: 767925208111f6b135ae746fcbdf031952fc8ea5a7f63f0b3468a1b6eef637a1
font_02_sfnt_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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