Malicious PDF — malware analysis report

Static analysis result for SHA-256 a37d57bfaa4b3003…

MALICIOUS

PDF

72.1 KB Created: 2021-08-21 09:41:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 64923b87daf87ee1509384789ef938cd SHA-1: 6be1ee4dde8022eeb576723b93abe2e3e1aa29dd SHA-256: a37d57bfaa4b30031c9d2003002fe3b85474f83b550c832a3141bb0513ab5aaf
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9523

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://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc9772ee08---kogubukedusarixebedivodir.pdf In PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/zevavemapamelixukof.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/b44018703a8da9f2d9d513c0105c7617/tirakividimema.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610913b22d4be---mupixudisuxagewofeweb.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210603100015.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16107dedc2300b---59793799024.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/zagoviborurenagujab.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tewujepupebixedobokoti.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160baccf7cb7ac---9825880176.pdfIn PDF document text
    • https://duvarkagidierzincan.com/userfiles/file/2613561045.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9ecf1465f---didepiv.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/beliduzenoko.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/1a392a6f028b727582883916eff7482c/dekode.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a7ae528b3050e0c410e7cf600caa441/luwetewajumotuwifi.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8d9358990---gazemasolonimotorux.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ac319f77---wikusotuxuzuselanujisi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160748775d0323---19348385406.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/680496084.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/92564209265.pdfIn PDF document text
    • http://blevy.com/ckfinder/userfiles/files/27342767572.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/94940530901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=q+es+una+celula+haploidePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01B 10572 bytes
SHA-256: 7e6c4e0d873b3019fc4c0890c362eb27b1d61dd4708210c32a7f2cf674b69963

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