Malicious PDF — malware analysis report

Static analysis result for SHA-256 8627b4e4a261c776…

MALICIOUS

PDF

53.9 KB Created: 2021-08-13 20:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21d96045399a25369d995bbbc8b8df5e SHA-1: 0112902631c8c4d3a3fe87a03659f785247cb35f SHA-256: 8627b4e4a261c77605f85d68c5567308bc498742d37b09537461e0c446e4e91c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7543

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://inwebjor.ru/uplcv?utm_term=descargar+libro+historia+de+espa%C3%B1a+2+bachillerato+anaya+pdf PDF link annotation
    • http://kiiga.ru/userfiles/file/12800181272.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/80c7a71c7f4313c4c1f790a1059f2cc1/71838789109.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/975d43201bc534d00a24bc0e5b03604c/wujaligomefokijipaj.pdfIn PDF document text
    • https://ccskin.com/geektic/files/redax.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/lsgi2i2nvit32sirne047lopoo/71797417960.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/lokazafakat.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/9c7gu2cqn2nh172qkrsps5ohs4/jobopekesebanutavameleg.pdfIn PDF document text
    • https://synersys.fr/contenu/file/vanasaba.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/vivelajotifekun.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe35040942---22261191171.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c290041b350422f4d2dc36002d14817a/91324615800.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/legafewuzo.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/gikazod.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e8f4c5be---15823909347.pdfIn PDF document text
    • https://marosme.ro/hirek/file/19187529658.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/juloxokowaka.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/81640243962.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/78516455693.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/76662484650.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/pomujujilowupika.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/33767811704.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ef616529ce8a2d78e48b8438c474c04e/gozekunukuvigezer.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/bivuxef.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///lugosidugodogoruveka.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_off0000b4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AD 15212 bytes
SHA-256: ff084050e2e84e43f4473e52bcd820e029d112f51b1ecb6d738052d6da190f8a

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