Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb413102aa94025e…

MALICIOUS

PDF

86.4 KB Created: 2021-09-17 09:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fdd9f860c53b4d2b5e42cdc01d56aaf0 SHA-1: 0655dff1705dbcb18a99c6f94fc466925ae19c51 SHA-256: cb413102aa94025ec2f680f72d31c7af4200819f696ca9e11ae534950589213e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to distribute malicious content or manipulate search engine results. While no scripts were directly extracted, the PDF structure and the presence of external links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://chinasoftcore.com/userfiles/file///nifipezakitesarap.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7o12jb9i3a50k3buah4lmbcgc5/12299469705.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/dojibu.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/60602353870.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/60ab20d3f0fcaa09628ecd43aeb67012/55199640877.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/kaveludewonakazewusewaze.pdfIn PDF document text
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/91440453628.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/c2v13bnq5pm6t0qgbh26ul48i3/gopunoxakot.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16131d2e022626---82299323312.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20644995296.pdfIn PDF document text
    • http://varadimasszazs.hu/uploads/files/rumitufotojajo.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/20361070795.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/64076022191.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/83842304771.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/nixiluxusawewematowuroka.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/39c6fbfefc3a824ed5fe10bb640caa16/waboredajosedinegar.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/69330093727.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/100119344003.pdfIn PDF document text
    • http://grandfiltr.com/files/file/58113059500.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614040914f3ca---74285377582.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f611d3e62a---65899402709.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/84853728739.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/67017060759.pdfIn PDF document text
    • http://freeski.hu/freeski/file/67944339594.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/sujekatis.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/41301826246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=best+android+processor+2020PDF 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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 17292 bytes
SHA-256: a8c4896d18e97c4477d21f03993b5589686480b8bdbf8efeae3aad97d79b0b96
font_01_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A0 10756 bytes
SHA-256: c27c8d8fe9a3f71e0b80f988670f9068203b3eaf352ba53ab8852ce14faf12ef

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