Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac7ea0b5c0b7550…

MALICIOUS

PDF

80.0 KB Created: 2021-08-24 23:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d4b76a381c1b04e5f25b6c86a137523 SHA-1: acaaac57e948307377a9852a0bda4193d7c30cca SHA-256: aac7ea0b5c0b7550495a3460abaaf1f8745341daa0c2b6b2d2ee6f042d829b22
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the link farm and the PDF structure point towards an attempt to exploit users through malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7981

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://infrive.ru/uplcv?utm_term=sickle+cell+anemia+is+a+disease+caused+by PDF link annotation
    • http://tuzvedo.hu/elemek/file/6617707647.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608091e6aa727---dotidebun.pdfIn PDF document text
    • https://argumentua.com/i/file/jofugifunitomaluriguzufaz.pdfIn PDF document text
    • http://eiffelflowersquesnel.com/userfiles/file/mofofuwatabu.pdfIn PDF document text
    • https://collegemahan.ir/basefile/collegemahanir/files/lukezumimufarenala.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/norawepenubapo.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/1d88a476a072d54265e15e1c41e832c2/zixotuno.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/47377426277.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/mijelizexunixenomojedixod.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/96507230671.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607364e000570---34206141144.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/derakuzawori.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079efff7b341---tetipuxijemefaf.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/96904295800.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/tibasofolojurazekidilu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/dojotumu.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/81073008309.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/4f86dab185c2c13586a863df784e90a8/8862150281.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/koxigaxuxuxes.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16115d2eb09d2e---gegigobozasunu.pdfIn PDF document text
    • 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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10519 16472 bytes
SHA-256: fcd171e04e7f2396c844d01a98032917de38f87df961131f6898fd13b7ef5277

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