Malicious PDF — malware analysis report

Static analysis result for SHA-256 acff24fc353f6e26…

MALICIOUS

PDF

82.4 KB Created: 2021-06-29 19:38:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d35941f86c75cfcc89d929c74141cb SHA-1: b00eae2b9605d5fe2ed63b84492b2a556f1b1900 SHA-256: acff24fc353f6e260c2cc14dbb32e25ba51f1da3ed8534adc93ee6600ef5e8a2
156 Risk Score

Malware Insights

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

The PDF document contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure as a link farm on disposable or compromised hosting supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/8vtklo8qakcvjeebe6296ie9ne/47967165207.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/pt1rpbhg6oggn5tj83njkbfuii/kugufesedasafafe.pdf
    • https://hotelmitrutarija.com/uploaded/files/36776189010.pdf
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/93054777806.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971ead0b42c---devixefe.pdf
    • http://autoshiftbid.com/fckeditor/userfiles/file/kanudodevujed.pdf
    • http://csc-0898.com/userfiles/file/20210618190428_ipxkvg.pdf
    • https://powermailer.in/userfiles/file/pidofovetidajaxo.pdf
    • https://mobile-translator.eu/app/webroot/media/files/mulebiwemakarovi.pdf
    • http://zavalinka.by/var/upload/file/fumusimukojux.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/452d37f66c1170d85b8781cd64e7c566/57932240081.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/4293b3ceac5a883400df0765e95c231d/26756174881.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160729cd2345a2---lojefasuwex.pdf
    • http://bahattinburyan.com/userfiles/file/33343943480.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090827d559ab---xebalerekozosanav.pdf
    • http://mnogonomerov.ru/uploads/file/fafopawe.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8fckg4bnt0n98o6hbhfebq4pc2/84616397791.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160908db473ccd---13268042895.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdaa8b75a---92284494355.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160972240da8d9---falikitetuduva.pdf
    • http://suachuaspa.com/upload/images-content/files/19137051568.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/37cdt41am43he2tht4hnmbn663/tubibameluge.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=indian+numerology+compatibility
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a5.bin
869fd76c4cea59ab61e64f3f761ea063d526ffe0db598c2a81b60a2547a2ff55
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 16076 bytes
font_01_sfnt_off00010b53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B53 16792 bytes
font_02_sfnt_off0001236a.bin
a808e31b56b12772e4792fac22135e9a61610a81a7b27b49df844d47e5eef0ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x1236A 10992 bytes