Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a1d41df3b54834…

MALICIOUS

PDF

67.9 KB Created: 2021-09-03 03:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5ed80a378d1d12ef2ed6b658cb7abb5 SHA-1: 3afccd4626b9f890c3ce5a4c7dc1f62af02fc643 SHA-256: e4a1d41df3b548349cfa5a3e87600fb8741aef6491060fd677cca2fd66495def
154 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9158

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 https://laborke.ru/uplcv?utm_term=princeton+review+1007+gre+pdf+free+download
    • https://penal-garazh.ru/files/69154970677.pdf
    • http://splogservice.ru/content/file/zovejudujuxajikipudaz.pdf
    • http://puppiesjust4u.com/clients/c/c8/c8a8d0e690f73854b1e7a5fbb9521f82/File/83328567439.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2a7324103---38400740285.pdf
    • https://presstone.hu/userfiles/file/luberimuvoben.pdf
    • http://kozszemle.hu/uploads/files/29057553646.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/37265542876.pdf
    • https://bisnismedsos.com/userfiles/file/gakabelulaw.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/13c788638b5d1cd7dda11389ab7bfc34/29869220381.pdf
    • https://www.scmsgroup.org/ckfinder/userfiles/files/jemizifagedawodeku.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160862dae9aa50---rabomemiteri.pdf
    • https://adsbudget.net/userfiles/file/namawazikumenirupuxesuw.pdf
    • http://klinok-saintp.ru/files/31765426834.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/bde3bea4cfee41918e0ec1257f957652/78280304769.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/fisisuzipesugisebudig.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ca809579690a71c84b88b1cbaf4169ed/7341276760.pdf
    • http://bukhatirhomes.com/userfiles/file/7829254146.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/217kaja6cjv0eg77th4uv5vh01/fijolipisiba.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf78bc33397---59256785521.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/q10pueupk3pco6rjh6fmqcbu8a/nexopew.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb99e96bb0---sarikito.pdf
    • https://ost-fogging.com/upload/files/rinipelimupi.pdf
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wisolurobebonoluteme.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.