Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8ce5bc05988d41…

MALICIOUS

PDF

80.0 KB Created: 2021-08-12 11:33:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: edeb88972c37d5e98b58f03d3a01904f SHA-1: c080214b7345a46df84628fb720b075031655984 SHA-256: bc8ce5bc05988d4186b81f8187f686b7fa67817bfe93d9eee5bfd7f336e85784
124 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress sites. The ClamAV detection and heuristic firings indicate this PDF is designed to lure users to these sites, likely for phishing or to download further malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3499

Heuristics 5

  • 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
  • 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://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/431555601b0a99470ac04421074d2014/15999938266.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/1f30c62499dabdfed66091aa70afe23b/22172032015.pdfIn PDF document text
    • http://winso.tw/userfiles/file/senalowewugobof.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160da22f2b57cf---64967073808.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/46cf5b47754ff9b34ee7abaccfcf161d/xalun.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/vutunabalemitib.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb2da5ee0---mizoxupikofedirirapow.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/86073964485.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/o9li0cct7hal6p6b40s1uuvvq3/pivegerupebika.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vp3ub3pc7s20thlefhgfopa526/59107142411.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608205195c999---721275241.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094ecf42e7ef---58658582014.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/gisogoxeruwawab.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/61356586691.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210607065449.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/77172020197.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/48364278556.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/08de6af7ab23fcd5c6c0fb6a95b562e6/12394226743.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ec9f64ef3---60456574149.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/mifujomisezo.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/25sf8f1llfkkgtj4njua4jlc46/nutilomulubifi.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/12511779778.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/22506443356.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c6eb237050010731d6d1042276e91971/wunexake.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=what+do+the+notches+mean+on+benelli+choke+tubesPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 10860 bytes
SHA-256: be4c3208799cd79d7e0f9d8ba6fb4fe0bfb2955f606b0ddccdcdae1786b2525c