Malicious PDF — malware analysis report

Static analysis result for SHA-256 6921a8d1a932492e…

MALICIOUS

PDF

63.7 KB Created: 2021-09-02 15:07:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 20c922444aab42a3996185ef0217c0ad SHA-1: b07e3691fab7c6f036c24bd08209ebf3edbbb06d SHA-256: 6921a8d1a932492e9431796df2f6ba04c25c82373a6b40b0c33ed46bf60077d6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple distinct hosts hosting similar PDF files further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8766

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://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a7f37dfd8---fenoz.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb56e1a09d5---fosolerapadinetidivufa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160f58fc8334fc---23685510192.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/52903948202.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8c1da6fc76515500e457733c6650ae3c/52137482972.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/60783968828.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/9294f1906c46f9ae2941bcefe7a54475/wimupadevika.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/4527943057.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/94749807135.pdfIn PDF document text
    • https://s-h.cc/uploads//files/202108020253477363.pdfIn PDF document text
    • https://anjingliar2.com/contents//files/woluxawo.pdfIn PDF document text
    • https://dhesient.com/media/bokalopagogesuviv.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://rzn-house.ru/upload/file/49540747614.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb51a307e29---wawasuvonifekisizukagazi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/fumuwobolaberudiximutuzub.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/74330145951.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/62301675140.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/lnh0t4g7jladiejd5106l5u6ds/12373644522.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/sepojaganefezugolitagavid.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/qqavggcol84sslrkh1f36hjfff/bebabibet.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/38639093888.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/bavumurakevemojutegisa.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/nuxunob.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/voxelawabefaposipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=ulama+ki+fazilat+pdfPDF 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_off0000be40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE40 10192 bytes
SHA-256: cc4c9a80e96fb7a5112adf719b981aa37c4e35cf82f223dea60f9c6149bf0806
font_01_sfnt_off0000d510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD510 18680 bytes
SHA-256: a01ef0203b84bb5d0181dc6f79dcbfecf4dddc6acc853919abbfc739cb3f13b3