Malicious PDF — malware analysis report

Static analysis result for SHA-256 48afe623fb417651…

MALICIOUS

PDF

87.5 KB Created: 2021-07-31 07:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: f561e943a6490c54d0e57acc77914518 SHA-1: 55d7e8e2aed9021b2225c58d7e806935c00c4332 SHA-256: 48afe623fb417651278502bb66cc6fca26a945276bdbc5c78fb66db059d28f3e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites. The primary function appears to be redirecting users through a chain of links, likely to deliver a secondary payload or facilitate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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
  • 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://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/15657589852.pdf In PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ba1f2ed06e55c04bc551986ed3a43f94/97273470803.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/30451330845.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/jomipot.pdfIn PDF document text
    • http://tainghe.vn/userfiles/file/18050834431.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/7a0525a93d0d344bfe3ca64832fff6cb/fusadavul.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089fab7d9b9f---lefigozetofawonekeramij.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8754a81539fbd261b6902d024da4d33d/xopewubojitemale.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/viwigebaxijuteromo.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/691566005.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ca5befb6---65315652910.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/nelasarazepuxelifijelid.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6a39d455a57bba7b1538b73f6682f331/81783976736.pdfIn PDF document text
    • http://kmsenior.org/file/files/7878669696.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acddefe445a---40964693749.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c34aef8912c---54762040254.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pazemobefurawotisaba.pdfIn PDF document text
    • https://rm-parketi.si/uploads/75392498002.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/jefenujapujazivobi.pdfIn PDF document text
    • https://ebooksweb.net/files/file/59829546306.pdfIn PDF document text
    • http://axwelindia.com/uploads/sanavugesabelirifubuperi.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160896daaab807---tuwobir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sicario+2+day+of+the+soldado+script+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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 10924 bytes
SHA-256: 59ed419c20cd8eb7b2e9d6ce2984c41ca9f9bac523e791ac4e56f5a597cf1505
font_01_sfnt_off00010910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10910 17416 bytes
SHA-256: 747fb36c60d479ac83c52e60c155c06b2ca224107ae5465497b0546f43832669
font_02_sfnt_off00013683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13683 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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