Malicious PDF — malware analysis report

Static analysis result for SHA-256 4811e5b09db66e1b…

MALICIOUS

PDF

66.2 KB Created: 2021-09-04 08:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bbc4ceb5cd32e518d76474bb1487751e SHA-1: 5679813d182ebfd6b73050f0dfb92981bf25ef55 SHA-256: 4811e5b09db66e1b215a83b564786d1d95926a2cb635bf60bf19e250fc1f9f3d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8210

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 http://langfordfinancialservices.com/userfiles/files/bigefeduwiturixugorufo.pdf In PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/e51772d68ede107e345ee6e3c2738e60/lasibifagefapijase.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/69046910587.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16100d96ba8955---xofududidox.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/joragoribumuxowokura.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/12947899421.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/9ebe7c2dcfaf8004513cc75947e485cc/36558972056.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081fde1ca827---55825158636.pdfIn PDF document text
    • http://vce34.ru/attachments/file/67391644626.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/be61154df69a75bc1615d52075fe38d5/36293037705.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/natomurude.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/janowesemimiwibutaviru.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/jetivoxesijapelo.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/68835167451.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/lafebu.pdfIn PDF document text
    • http://armanetti.com/images/wimelegobatitexonuxu.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/2107231307594952011uhof.pdfIn PDF document text
    • http://usateatop.com/_upload/files/gaxesonadem.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c3csl962jh9soi9qvuref6i47m/56019552507.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/27127657411.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fortune+500+magazine+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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