Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd4e55a83546741…

MALICIOUS

PDF

81.2 KB Created: 2021-09-12 14:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0c62e010ea758753dc01b4c7453bf9b1 SHA-1: 7f226a7ccab7bf6d8665f56ec99661f94f34ec47 SHA-256: cfd4e55a83546741f4c5c9e5cf2dc6576ab30510c0e23c90b5f49bef647853d5
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. The document body is heavily obfuscated and appears to be metadata rather than user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd9f7febc---77531347869.pdf In PDF document text
    • http://hujiangsy.com/upload/files/70576459418.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/zutaxarejekafetilufotagix.pdfIn PDF document text
    • https://milosislandrooms.gr/userfiles/file/jomigi.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/xuneje.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/pegize.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/5457886d5213886c73808e3db158f4d9/32887162379.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/310ceb176f82ae18fed1ef0233c49045/56973356623.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/fejuvar.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/77393372350.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161380a57f1bae---61084154124.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/kokajawugufasinemav.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/rikoxogosofig.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/vezotiwameki.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/38936866928.pdfIn PDF document text
    • http://annabarons.com/files/files/fexeru.pdfIn PDF document text
    • http://jwconsult2005.com/file_media/file_image/file/pamagedut.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/64659508710.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee353055d2---16351440390.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613680e942c7e---75354865225.pdfIn PDF document text
    • http://scsytech.com/upload/files/70367292078.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/toraxepa.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/35659160545.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/91777928045.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7eeed0366---kodavefix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=surya+namaskar+shlok+in+sanskritPDF 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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 20776 bytes
SHA-256: 4c647355a6f590d05f83f2adfa90e6036e4a5fef52ae9bae961f90e4e2546ef6
font_01_sfnt_off0001076d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076D 10624 bytes
SHA-256: 250c145608d7007b7a8cf13511b37a6710f5abed0e06bf0f8bb0d756f217f798
font_02_sfnt_off00011f80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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