Malicious PDF — malware analysis report

Static analysis result for SHA-256 96c1910b055b9bc4…

MALICIOUS

PDF

62.3 KB Created: 2021-09-24 01:29:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f59b054cb6d2e74c3cbfdaae511435b0 SHA-1: 1d5f3413e39edd06db0f74fdf446267e01b81c0e SHA-256: 96c1910b055b9bc47e27b3c414d80097ed25fb47133764e8a71b47f22ffbeec6
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong intent to distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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
  • 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://wastran.ru/uplcv?utm_term=can+i+download+siri+in+android
    • http://frigotechreina.com/userfiles/files/74430350087.pdf
    • http://chanakol.com/ckfinder/userfiles/files/vebedewutukajixirutodokop.pdf
    • http://kaymccarthy.com/immagini/file/32465914615.pdf
    • http://syntrend.critical.tw/upload/files/xumefurewepurozowakulo.pdf
    • http://bong-dem-long.org/upload/editor/files/83895775348.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613818fa8befb---fibijinigejakesabumupaxek.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/7d167e4dd5cd9475c01dcb51d10e46d0/71070271068.pdf
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/52081383121.pdf
    • http://www.farmaciapenil.es/userfiles/files/60119956450.pdf
    • http://huonglonghotel.com/uploads/image/files/27767639517.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ii8s6bs3g23uc6lfa4t0kho9p3/wefalixa.pdf
    • http://211.129.1.225/system/ckfinder/userfiles/files/xibedodigarepuzigesusi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/b9aa49349464e8804ed6f678e023f49d/1891851130.pdf
    • http://jlssj.com/qianzi/upfile/case_editor/file/bovurevibesoxarowem.pdf
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/88953485374.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161389049be393---lodizepipepiterufuvabewiv.pdf
    • http://arqing.es/ckfinder/userfiles/files/lobegitarewagepevaporima.pdf
    • https://kolkataangikar.org/ckfinder/userfiles/files/13523219677.pdf
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/mawegegil.pdf
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/18305442149.pdf
    • http://life-worldwide.org/assets/uploads/files/buwosezosevefafipokumom.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/a6b190d74599f6e06ea96a51b3b9b5e4/39843095023.pdf
    • http://snp-ent.com/files/fckeditor/file/195368356613c13d482586.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2b0.bin
1172d98385c75f7c1b406965277a86c495570c1daf44f2628b4ac7219a1f4798
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B0 14324 bytes
font_01_sfnt_off0000d650.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD650 16792 bytes