Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ea48649348e329…

MALICIOUS

PDF

88.7 KB Created: 2021-09-07 22:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 422a7ec7296e08c08b80ca9f50f505a8 SHA-1: 0f31f3eb4cc41ba8ef0fe8d73493643764ca2960 SHA-256: 28ea48649348e3292e91d4946dcfd223c3f077f141aac54dbab4e3254294a1b0
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ClamAV heuristic identifies it as 'Pdf.Phishing.Trojan', suggesting a phishing or trojan distribution intent. The presence of link farms on disposable hosting and compromised CMS uploads indicates an attempt to obscure the ultimate destination and leverage potentially vulnerable infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2932

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://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb79e90438---jedakodefizesolu.pdf In PDF document text
    • http://hoachathoanggia.com/userfiles/file/18934146552.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/267345244f359d1c226952ec300c017b/17177075168.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609214b3ac540---lanemiwakotipewesa.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/90hpat8pk47aqg4ucdq7uq6h23/sawazujalosefelozifiwir.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/mepasezapetorijivaba.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de23b32acec---36770776688.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/55710431362.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/37492563407.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a1a04de1---2177072746.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a408ad9561---16083671605.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7fea18ee9---75877619545.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/bimipinamibu.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16070f06b06e9f---53630167224.pdfIn PDF document text
    • http://balone.net/_upload/file///26846618865.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/vipedulobutorejuw.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/13315728840cfa0c9a4c3f6efe602b59/53485981110.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/noxemujuwekakepemis.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-20/20210620095537709653.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb641659c7---76986522803.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/hn22rskjvh3lne0bp95u5qbbe5/99715235940.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/pirurizepelunemifal.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/40826442213.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/bdc55b78dab46a04ae09cd8f2af3af7e/89472646337.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbfec9b336---14768481527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=manual+t%C3%A9cnico+de+olericultura+pdfPDF link annotation
    • 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_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 21164 bytes
SHA-256: 9f04adfd5efae7cabfac11994dd0d861ea6290433c261de2665f0582063dbd3e
font_01_sfnt_off00013838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13838 10692 bytes
SHA-256: f0bff8bf4d22bfb8e7ed2b0623f4c9106afbd22c13ae9fe1737b49ef70880584