Malicious PDF — malware analysis report

Static analysis result for SHA-256 d55bcf346a86f2fe…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 22:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d8dce7798ccf7ec02145a641a30b78a4 SHA-1: 4eb57c55a15bfb5bddd4db8e7d0dd9bc65be89d2 SHA-256: d55bcf346a86f2febaa5568b86c2d58fd309424b84936eb1409b5d8c009829ae
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF link farm heuristics indicates a deliberate attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/oinh1sa0mfqcir0fdeqspajf4j/3882147638.pdf In PDF document text
    • http://vidol.nl/userfiles/file/11833049490.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/74430665796.pdfIn PDF document text
    • http://royalgroup.at/tmp/jeviwemukozefap.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/77678480888.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/vajeta.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/skra06fd2jfnjdrd4kg61519m3/72250811060.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608770a3dbada---mebusebepezukep.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa88a260f50c2aadc7230477006310b2/vufinosobuvizujipejafage.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/6088620319.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609944a1f3676---morokulazokizun.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/setuxilewo.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/827432642.pdfIn PDF document text
    • http://alltechsro.cz/files/guvedaresidakatukarazab.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/s6uujlmcucp2naof47he715vmu/femejagefexigafukidubigug.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/30812ffb1373da19a812118199418f4a/dixipopimirilejekesuvo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec88feabc7---67977191000.pdfIn PDF document text
    • http://talleresjpg.es/img/file/linevikeraz.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/82261330042.pdfIn PDF document text
    • https://digireg.it/upload/nixexos.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/xoriwasu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbdd4bbd7ef50de882543764b4f138e2/23473080686.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/11930287329.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210807_9695FC52360DBD27.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/44861656609.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=noun+number+exercises+pdfPDF 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_off0000da00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA00 17880 bytes
SHA-256: bf4b85951f1bda5ba6ac971ebf8b9ba3468da2e0c6f0b91e00e40bd04dd3648d
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10792 bytes
SHA-256: 832ae36f1be4b51299dbf56a651ff7eabce9aca574687b0bbb92f1ac3ff1536c