Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcefae76fbc878ce…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 02:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 71a514745b0b974a0f19062b3924f0b9 SHA-1: 38ad5aa88d1a10cc951906e132ecd484c083f5bf SHA-256: dcefae76fbc878cebe8909113a395d23996ed53b38ecb4e8c30ac1e72da06386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple domains, some hosted on compromised CMS uploads. The presence of embedded URLs and the nature of the link farm suggest an attempt to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=best+website+for+essays
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/d0f139508b5bca72c46cfa2e371c5221/koxalamatomuveg.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/dotoluxunapafufugizuzu.pdf
    • http://sonarkella.com/userfiles/file/18913871228.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/59641118595.pdf
    • https://dadrarad.ro/userfiles/file/95728799508.pdf
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/sosapurexit.pdf
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/mevofukabeg.pdf
    • http://tinhdauvietnam.vn/upload/files/99100695462.pdf
    • https://demetraproject.eu/ckfinder/userfiles/files/julire.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/8348803779.pdf
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/36249b0cf44906c374dc79f8d24bb9f3/fejukazatuza.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132a945798f4---19395933318.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/6970346103.pdf
    • http://hyunshin.net/userfiles/file/20748992064.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/gumipodemivutomapidid.pdf
    • https://www.informacion-indoorclub.com/boletines/img/file/vopidazon.pdf
    • http://mail-ex.net/userfiles/file/kupagigozexegavifigekujup.pdf
    • http://zhuxintrading.com/uploads/ckfinder/files/20210918/16319458102893.pdf
    • https://shriramsteels.in/public/ckfinder/userfiles/files/sededukusibewitonaruwoput.pdf
    • http://intproplaw.com/admin/uploads/file/zusibaruwir.pdf
    • http://sabancilojistik.com/userfiles/file/53911503184.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e90b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE90B 16792 bytes
font_01_sfnt_off00010122.bin
76b6f0bb8b5b30946dfcae3af6dc49b12185f60f117ff8374c42a8f7384f22f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10122 10452 bytes
font_02_sfnt_off00011924.bin
9b03e4059e84125f7ff38858188100d38962421edba3e9341935b3d2e00c9ff8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11924 18828 bytes

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