Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b5ddd55f0ae10e8…

MALICIOUS

PDF

91.5 KB Created: 2021-09-06 08:36:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0806c9d9c0fc6d20b31190ede67ef048 SHA-1: 084b8aa01df225519013c6abccf6313eb7c4fdea SHA-256: 4b5ddd55f0ae10e8e11cffa6f3f958b16587157d9d2d9292cfe16ec83aca16f7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a link farm pointing to various PDF files hosted on compromised websites and disposable domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document's primary purpose is to act as a link farm, likely to distribute further malware or phishing content. The embedded JavaScript and the nature of the links suggest an attempt to redirect the user to malicious content, potentially leading to a second-stage download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5261

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://smidgel.ru/uplcv?utm_term=verathon+bladderscan+bvi+9400+service+manual PDF link annotation
    • http://indel.sk/userfiles/file/66770140873.pdfIn PDF document text
    • http://connect-event.fr/ckfinder/userfiles/files/67110633155.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/wukagojilisutop.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/vefenakonewerezomi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16088dfa159002---98679900016.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/88983767919.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/33658666913.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/9efd6d9df2bba906bda8d2058409196e/vunetizekujolunulilogur.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/55245532230.pdfIn PDF document text
    • http://rayanchem.com/d/files/nekozuzow.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d1f2a2676---besojonovog.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/dopuvenegilapejuvuje.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607327bc930dd---juruxomi.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9dd3ea97---53726961551.pdfIn PDF document text
    • http://hong-tour.com/FileData/ckfinder/files/20210819_5D8A1BC704FAEEF6.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/53839186376.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc34ef1efa---3387413464.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609758aaecb82---82675339904.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a160bcf363d---71071097641.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/tekuxasivemodubopizipo.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/gibupoturofuzatiwinawiwa.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/nulamobatenuvi.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/fa61d8648fd4fc576228ec182df208ee/roboxozukowukupegezuxusur.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/fanusizuresujezeg.pdfIn 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_off00010494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10494 11280 bytes
SHA-256: 7b715a8eeb7d62aa2290369a9189a68b5435c176047193de1b18909f24f4ec7e
font_01_sfnt_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136FB 19520 bytes
SHA-256: b77804e6106e86a72511e927fca5e5692feb67c8530324161f8925905612f666

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