Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe3450cd5974c70…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 11:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8bb290f318b324a5af2218788592f3ec SHA-1: 7bb88c7043906d42b49fa2b10fd7cd4327f483e6 SHA-256: afe3450cd5974c70f60248f8dd1598db293f2beba5b513edaa2688657a9df3c6
124 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories. The PDF document itself contains obfuscated content, but the primary function appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier clean score 0.1482

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://sergeca.com.ve/ckfinder/userfiles/files/97430587185.pdf In PDF document text
    • https://knurussian.kr/DATA/upload/files/202109051233505664.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/39248382804.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/9774827113.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/19234034759.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/990212265.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rizenawulibuzudidasu.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/62941862544.pdfIn PDF document text
    • http://majstrissmt.eu/www-data/file/22282936923.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613625ca1e711---13477333488.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7ff30b80590b92cb32e54493d6432186/lejidomiresufuzad.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/52567735817.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/72399221061.pdfIn PDF document text
    • http://kasargod.net/uploads/file/depivolepaxizazupelajo.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/vomizapesinisudiwobo.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/poleloxinisewaxuli.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16138a8fa7c1e2---49028293504.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/54243706073.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16132844f28bde---58139055362.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/dedusafofawukefugevutipej.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/72283590907.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/ratapetuzonalavefiw.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/76249701260.pdfIn PDF document text
    • http://old.smartplus.pl/ckfinder/userfiles/files/saputezinebadozebidaralin.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/nijumalugozobi.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/26276339625.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/20627851981.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16130c36c56dfc---48796067220.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=clink+direct+debitPDF 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_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 10176 bytes
SHA-256: ac9d187d289465e93d56d33bb2ce44fe39f311a0e3c299e997847ca624daec30
font_01_sfnt_off00012daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAF 18620 bytes
SHA-256: 02f70296d43fc23ecd6dcc7adc91a8330490476cf59ac5e975f8d7cc6af4d84b