Malicious PDF — malware analysis report

Static analysis result for SHA-256 b636e21e3aedb60a…

MALICIOUS

PDF

74.8 KB Created: 2021-06-20 17:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a645a012ca177c1a4b424531f53eac0c SHA-1: 117af78c4f2ecb781361b48c8478bc5a02a6bb62 SHA-256: b636e21e3aedb60a865380537b2264dca7aeb990d306664ebdf13a2b97c99db3
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 0.9765

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://inwebjor.ru/uplcv?utm_term=300+rise+of+an+empire+tamilyogi PDF link annotation
    • http://perles-del-beya.com/userfiles/file/mubanugofatarenigoripo.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/eib0krjvdl90nhs06gril1og4c/89046787580.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795d65ab7c3---34959538204.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/9a0f816c28f9d679f395f0b68c7d38b1/86039979586.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/93803330051.pdfIn PDF document text
    • http://computerdoki.hu/user/file/vijomik.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c37cfbe046f1a8d9d927f678d9fcf795/zokadele.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/jujefopunefepasivabiwepus.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094dcb83db2e---manitibod.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf50b9cd1---wuzadesepase.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5a3844f13---mazepedinujubariro.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad92679e7e8---vukegoketefol.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f11513faa---17105489559.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fd2c9f58---luxarivigetevapoxirok.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/vejisezozuvusawulilugupox.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/56813706885.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/nesobibagaxutonobanel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB8 5536 bytes
SHA-256: 6c0b5e6111ee348a2623f9be5b61a56c8004bd835c0a7a05b4bdfbb55647461f

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