Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4069da97d0d6f71…

MALICIOUS

PDF

62.0 KB Created: 2021-09-06 16:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9ee4027388948b5ea0287c580d6cf326 SHA-1: af9ebd6c786d98f0f92859cd2ede816cfde5452d SHA-256: f4069da97d0d6f7182f6684900ae8c45dfc831a940aae39417e072c8ef308319
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6844

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=cognitive+processing+therapy+treatment+manual PDF link annotation
    • http://softtox.com/new/userfiles/file/wipakowuniterawemem.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/5353224650.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/b9be34bed1067337c47b7d80db844f29/82200509858.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/80966052627.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/zusobubitamo.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/mezebajes.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160e18770d9848---nabakudikiwov.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/luvexeramatemibodew.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/95127496358.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094858e5570d---vofibimidimo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9b9f42d4d528ce5ebcae23de33a53536/keforuwetubiwikezinavo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/25034599624.pdfIn PDF document text
    • http://standardamulet.com/files/files/61165071046.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/xapunuvunolugekesikino.pdfIn PDF document text
    • https://12shio2.com/contents//files/mujeraradez.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/91039197466.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/livalibefaziwopefisowo.pdfIn PDF document text
    • https://europartner2.pl/uploads/serefarunusejewekob.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/fonufesovoxetomet.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160983c5a6664d---7412325148.pdfIn PDF document text
    • http://vidol.nl/userfiles/file/jibutokanofinorim.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/gepikevedetefizebes.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/62963974705.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feb9de6beb---48043730568.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea44094d60---mesuxuxobowisesigif.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_off0000c741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC741 11132 bytes
SHA-256: 68797a0bbe6ef88391c094a13cacbd6f5ea877a2ad8d477b8a8283c5d38417a0
font_01_sfnt_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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