Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed2f51bb89eb33b…

MALICIOUS

PDF

76.2 KB Created: 2021-07-01 14:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 113050fb513753f098529d1a7da6e54b SHA-1: 46c712cb5efada6792ee9444ec4185bfabca740f SHA-256: 4ed2f51bb89eb33b86c35ba29f3e2ab383a76e0f41c5cb8fbfe42cdbdab7410c
154 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. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support the conclusion that this PDF is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7921

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 https://ketchas.ru/uplcv?utm_term=meaning+of+gluteus+maximus PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ec9169f5---rakuj.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/14736214561.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/kedumikirel.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/lakirufeparari.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160776b671c4ec---8088304898.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/kujalobazirobatetaropa.pdfIn PDF document text
    • http://palami.by/images/file/48620240895.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb7e86bcb---43398835481.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b25d06c0a40---34009792996.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/48054406111.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b954eb5fa83---sobikenawaxisegu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/b8feb557f2c22266b534f0e5ebc59420/bugenarof.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1607c965730faa---namizum.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/523c1dd055dcc0f328d86eac8bff55da/wodexedoxivuwi.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jufixatejoratek.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b222b12360c---zimuremafanalipebewozetal.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/46054c6587e2ad7de53ca863e2096ffd/93937965976.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/06ov2inue95u43duisi0st8lj4/lowojusalupaxuwekoxaxa.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xenogonurek.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a2b86eaa0---kemagojibolaretiro.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/88879717939.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b408b5def---89667861663.pdfIn PDF document text
    • https://arerp.kr/data/file///telanabuz.pdfIn PDF document text
    • https://parfumzone.ro/files/file/boxidasu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 17524 bytes
SHA-256: 71ecd8a05a20cbf0473e466c1bfc15f5b817942aff2c785f6dd46789f252877a