Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3cfd627dce7c433…

MALICIOUS

PDF

77.5 KB Created: 2021-08-09 12:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 09404ba23346883d28d83b50b1a615a3 SHA-1: c0be89a1c8c22f6821cad52c4cf1d20ef37cb73b SHA-256: f3cfd627dce7c4338c7c2f21eb0263fb3e4c160d006306d8c6272d65e85db815
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress installations, indicating a potential distribution or hosting strategy for malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3747

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 http://veronikavilla.hu/userfiles/file/gupemegubo.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/01bbc8b14661f9613daf19f3dc52bd75/wapus.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/ripulivetebivume.pdfIn PDF document text
    • http://planetamama.ru/files/file/fukumigakuzokimizapisowu.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2767cc6768---27084457296.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef73b308cb---48582615809.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/1008fi6emmtvtbjtpb5o5futnh/8071956625.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/60320690630.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/42636478624.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/limuzo.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81f3880da---46292151413.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/nilezaribarivagomaw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072720fdaf0f---kiminokowuxudijosovod.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vetadomov.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/wenijidaj.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098d92fc6aef---wifexusamok.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c8ee584e4---ludixesibadokojigud.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb16e24bf54---70241426123.pdfIn PDF document text
    • https://kasihpaham.com/contents//files/devegejujibosezu.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/27201517455.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091939d60d98---99319568801.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/wezopazovulewuju.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/27604344317.pdfIn PDF document text
    • https://cargotavio.ru/files/file/nenememivifu.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/13166792754.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+free+gems+in+school+of+dragons+hackPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/57358509327.pdfIn PDF document text
    • 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_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF1 11092 bytes
SHA-256: 5f38123f181078a1de15aec045a4175346bfad9ee27edf8f477e29dbbbebc744