Malicious PDF — malware analysis report

Static analysis result for SHA-256 443af6885cb8c323…

MALICIOUS

PDF

77.6 KB Created: 2021-08-10 21:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58f60ed90574c1ed57b7bd2d2e7ee953 SHA-1: ebb2790c11d741abf9ea456527649921bee23b28 SHA-256: 443af6885cb8c3233877de21c09de612e3e467f2a0e2a056589bbef0f7782c7d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains, likely to redirect users to phishing or malware distribution sites. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9113

Heuristics 5

  • 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
  • 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://cfacgroup.com/uploads/FCK_files/file/wogipigewelulolebatujifab.pdf In PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075bc8f44b93---lireluvaxadaxavuwalosizid.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c503b180572---xazuzudutuwebifurejajadap.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/89334604687.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/pesazubizo.pdfIn PDF document text
    • http://snsi.jp/image/news_file/45654947438.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/datixejarorunofisofolitip.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/balojiwelidum.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/b3kp4sel5pc4tebmeupt63cs45/424525056.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/rovuru.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/letosedobelif.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/18039720677.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/pjb1an9618iopm4cv7gop31gg3/famakeb.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/piwubijasuremibepupipof.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/54981014561.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/josanegaronozejumi.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/c676c0604c3f28622b08a811e9cedc32/57899428745.pdfIn PDF document text
    • http://ciccioinpentola.com/userfiles/files/30862716113.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/ib5q9p2i0trbl090isujas8ivm/67409417410.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/s2juejkdf7gvi746808g71vbfi/gamiv.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/vovugoroxira.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/74166781559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=sources+d%27eau+chaude+pays+basquePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 10880 bytes
SHA-256: dc4655fd61f0c32c95934d6c1413be3c012528e6204cac785c17e6da6db81357

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