Malicious PDF — malware analysis report

Static analysis result for SHA-256 10de4ea88fb7732c…

MALICIOUS

PDF

65.0 KB Created: 2021-09-22 18:35:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: eed172e5d5f7393b83a4b059c4154c48 SHA-1: 4789c3c0c38b191340cb33640206de7f4949f5d4 SHA-256: 10de4ea88fb7732cb33b1c1fdc910e667ae680ecde25dfc1874c4366c1dab74e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs and links, many pointing to potentially compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8763

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=justice+league+movie+2 PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/tifigidobekunofon.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/walaxojilukaralenatuwit.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/65411789331.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c04d21d3b---25351680232.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • http://tandartsindex.nl/images/uploads/54586417225.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/dozusipawadoduwaneg.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a68e724ab73d8b2d6ec966c0b3bc1501/pujefuruwopige.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/1735186358.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/38732370094.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/pamoziwoxada.pdfIn PDF document text
    • https://forumsevens.com/images/file/zuzaxaxidurupuwonigagezej.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614320bacdaf0---97679677823.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/69511834377.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/wafuwif.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613596da3a369---477315350.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/796cfdd7b025c3eaa020302f003fc749/zoputubijewe.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/58085096859.pdfIn PDF document text
    • http://surestegc.org/documentos/file/24697739833.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/joworonivemitigoxowape.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/jitolejomonoxigom.pdfPDF link annotation
    • 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_off0000d660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 17652 bytes
SHA-256: 7218edb205f03ce858ce0def77f6cec7e635e2df1045b642283d791de90dc0e7

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