Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecbd64be3d160484…

MALICIOUS

PDF

70.3 KB Created: 2021-09-18 09:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c40ff82fc5db80a56202e77c074e094 SHA-1: 7ce74b93bbe855473147a8ed460a903573f2cb9d SHA-256: ecbd64be3d160484b68778abc145d64b703da6875ff787622243f2759f63fcd1
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of these links indicates an attempt to redirect the user to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6930

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://wastran.ru/uplcv?utm_term=asphalt+8+apk+ios PDF link annotation
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/17959997768.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/rixopomimimetamazava.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/negimodugufakitebasoniz.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/736a30ae8e35caa4e14809b25cc8afaa/fuvutakezutini.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/sewolasitalavotebiso.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/94709947470.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/49656649529.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/81053853341.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/peluvadi.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/muwijalajunajuruxanezere.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/gigadumosatoperijejozati.pdfIn PDF document text
    • http://nwatchonline.info/userfiles/file/9243120413.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/safolojo.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130916270d61---3594966258.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42874365948.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/38181517127.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/42316907053.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614224db05dd8---37971955307.pdfIn PDF document text
    • https://goodline.by/userfiles/file/retufepirifudujogik.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/fijojagogim.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136497eeec64---najaleguwibowotinepuwizu.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/riwukavu.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/32246699553.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/jexulusuwujet.pdfIn PDF document text
    • https://riwg.in/userfiles/file/33581075772.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_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 10292 bytes
SHA-256: 602009b1e89a9fcef118a5e4bc6851de53f94e487a391d54cd93e4916c68fc21
font_01_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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