Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e8f488d003636e3…

MALICIOUS

PDF

133.3 KB Created: 2021-07-31 17:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a4eb957cc2cfa1c7d4f36ec2ec95065c SHA-1: 5a00c0a8af2b0bd3d325898adde1097339b621bf SHA-256: 6e8f488d003636e3a1e86de519224f0e4e27c13eb7df51232789ff4a78da2bfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The primary purpose appears to be directing users to download further malicious PDFs, likely containing exploits or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7706

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=data+communication+and+networking+3rd+edition+solution+manual+pdf PDF link annotation
    • https://kozhikodedeaf.org/admin/my_files/file/67374796880.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6bfc193c2---woxufaviwu.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf516655cc---nawozaj.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b697cfe4---84638654033.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160813fd065d2e---duruvopufigexafigeju.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/tufalo.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d7658240---xawoxuregelajaxinopimo.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/lovubotitegesop.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607b75aec7396---tetate.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16089db8b72e03---worudixexologobi.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d2524df6a33f194a03d121c13a5f6374/33306857484.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afa5be4a262---1748626703.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/zimobe.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bofofadumijisidiramubux.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dibilalezekiriwuna.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/doruvusuf.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/93911295078.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaac70f780---netalufaliribojasitunade.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb89f9b545---fiterevoludinekomerebol.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/85776129247.pdfIn PDF document text
    • https://hchoanglong.vn/userfiles/file/dasujuzevenirenu.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/pisugo.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/lf1npektqr6vrnj3jeb71jpel7/govezuwakutenejujimajo.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16084107fe7978---jelapemorodami.pdfIn PDF document text
    • 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_off0001f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F61C 11416 bytes
SHA-256: 03e071752526d7316db9fe8d795355772603bb6d19bc4f30c134c066069bfbb2