Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d7b664b8b52fbe2…

MALICIOUS

PDF

99.7 KB Created: 2021-07-27 17:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ded99f8938afa67bbe1a7488a97d32ec SHA-1: 167663a3bfec920cdfd4231a98c0af1ba95d9c82 SHA-256: 9d7b664b8b52fbe2aaead224241fd417c877aabdb16d901cccba5e83004a9f55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The PDF structure and embedded URLs suggest an attempt to redirect the user to malicious content, likely for phishing or to facilitate the download of additional malware. No scripts were extracted, but the PDF's nature strongly implies a malicious intent to exploit user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://honderhotel.com/UploadFiles/FCKeditor/20210723030858.pdf
    • http://ecompletecontact.com/ckfinder/userfiles/files/80218207850.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b0d35f851107888e0222856bc6d4af08/41935379050.pdf
    • http://www.peretprod.ro/content-images/file/dewopikevonedej.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850a0115880---lawon.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/nuwukevidotatapo.pdf
    • https://onhimalayas.com/ckfinder/userfiles/files/60444862783.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c1216121d---61666105666.pdf
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/129707eebcdd31850d3aeef34c178cda/38802721838.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/eb355b04815a72df69d7127a406fe0ba/pivufofipegozedijop.pdf
    • http://baigeleather.com/userfiles/file/11744788519.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/nfvo65gtcavjtikrrorna1baoi/12830947885.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/f376dfb314a38538b6f2cf617acc79aa/89344336381.pdf
    • http://www.tamtrebinhminh.com/public/files/zozazutepijo.pdf
    • http://osoboebludo.com/ckfinder/userfiles/files/labumomivufagusede.pdf
    • https://digireg.org/upload/beniwe.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/86a9c59680cc712a44b09af4efcdbf49/kiwudu.pdf
    • http://abacusnancy.com/userfiles/file/wirinuk.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/702d39bc76588403c2b38f49131254b4/92461867144.pdf
    • https://bamor.org/userfiles/file/nimizi.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b857a1082---vakudajadalesateg.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b2efaf3daf9---50973677069.pdf
    • http://jfhcoaching.com/userfiles/files/goradujexuxitiduwuta.pdf
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/763c32c141c7402a0c19c5df09c41af3/kolijaxukudelemerolofa.pdf
    • http://arcadia1973reunion.com/clients/3/33/33cb7023d77084166ed027ca16b579b7/File/fugiritevog.pdf
    • http://zafirkort.com/uploads/files/25987234428.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hosanna+marco+barrientos+acordes+guitarra
    • 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_off00011d05.bin
e907054f2dc763d0eb9f3fd76f4647e3453bcd869d5b8739e19f308c43e0658d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D05 20064 bytes
font_01_sfnt_off00014fa4.bin
a13fae223ac16b0526f7ed603594301bf90f6549e32815d018b38b8bae2ce66c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 10896 bytes
font_02_sfnt_off0001689a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1689A 16792 bytes