Malicious PDF — malware analysis report

Static analysis result for SHA-256 26626212a89344ec…

MALICIOUS

PDF

76.0 KB Created: 2021-09-07 22:47:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bb13c0125304105f9b2bd8868b2862b1 SHA-1: ae5e59ba56b9223866e090c1790321387905f37d SHA-256: 26626212a89344ec298e5a3f8ac9751bdd21ea3cd0a81c465775e8e31b22497f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to compromised WordPress upload directories, a common technique for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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 https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc928e3b27---94176316678.pdf In PDF document text
    • https://loctra.net/userfiles/file/7645696518.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gimizupeto.pdfIn PDF document text
    • http://siembra.me/uploads/files/rikudorewitutubagojogole.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/79718144077.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/megegisufawabadowusuz.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0526658e69---77244954080.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021080222542279.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/juverubakawaran.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/9q3fna92844cf2404v037d0m4k/bixufegumimatek.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/89088403067.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/12422885379.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/lekuvivar.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/zulijo.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/waxukef.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/48233442220.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/37d97c3a73f7834674ab7f483a6e243a/mudej.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/5302355760.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/sitinozujivojaka.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f42437d9b5c---12806026053.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/12827003775.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/solojunafitosagevuso.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/84513133205.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/84087430448.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/lavuguvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+adventures+of+tom+sawyer+penguin+readers+pdfPDF 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_off0000c64e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE65 11228 bytes
SHA-256: 2162fcb785dfa904825b0824ed23561241bb46d77df49af1b2fd106e6ad69cab
font_02_sfnt_off0000f863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 16056 bytes
SHA-256: d42392f19e1638247810ba4dd7e7fa435f821ebf37f076d9cc95c11ed7312e48