Malicious PDF — malware analysis report

Static analysis result for SHA-256 c363303afe42fded…

MALICIOUS

PDF

85.0 KB Created: 2021-08-22 00:32:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7268de7ef8aaae075f7d29ff4b9daaad SHA-1: a6b32033195914e5ec2a4df147a141dcf7aaab85 SHA-256: c363303afe42fded0cf0bbca65c7ddc6874e904cb93cce139a248f7717940f5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of link farms on disposable hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b7b3bbc4---xikebovuxikakonolajor.pdf In PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e692cc9c9ad---givuzigamefibones.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05803c6b9---wowafidinapugan.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ic0bsfl4lme7td26r42ie38d82/toliwimanugigomopelusaf.pdfIn PDF document text
    • http://drironcat.com/images/file/reliduludukilirupe.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/damubutejaval.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38270724145.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ffafe6d1a---judune.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751985e9f45---58964755036.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/40763720543.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/tah7e42hp1shhe9n0tgmsitilr/96397423016.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/4dc277beb01dd83493bb430a7f4ac89e/zalapijisigalebulit.pdfIn PDF document text
    • http://vce34.ru/attachments/file/gifibotemiwexuzudezegudit.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/jupok.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098c47baa022---fazafojomagavudozupur.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a5d19686a---35055510196.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095da51c20f2---96830224418.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/3505dc22e379482cadac03c5725d1be5/wilujutubuligazo.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/109974ab0abfe48ded85444ab19c5aa6/92878897.pdfIn PDF document text
    • https://educhina.mn/editor/files/77139633754.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/87377b6ac3478c6918a8a16a88b66a4b/31166914777.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/16af601cdd1ce13fa4c1fbc71bca1b79/virosetidukepenukav.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/04b38fc16b213821ce2ed0f6f6332503/wagamizutokuwudokobisedal.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hufioh7ohdv0h117d6n53m53a0/vexerenekawoz.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/5770636241.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/k05a8f7b8peqpd5o7t09l4dlg3/tegerixurizudanorawota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=what+are+jolly+phonics+tricky+wordsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001009d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1009D 11028 bytes
SHA-256: 21630673ea30d1f4bc6d56a4d297a8abac0c0b3065f0f1ed0fcd131fe41a81a5
font_02_sfnt_off00011a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A40 16576 bytes
SHA-256: 5641dfac944603ae34b7e97bfbee3a9eb57d6ade4efd05be19c8fff37984c371

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