Malicious PDF — malware analysis report

Static analysis result for SHA-256 b01ac87fe916284b…

MALICIOUS

PDF

73.4 KB Created: 2021-07-09 14:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ca0e5a89a9e985aa3b6f5ed1066e1fa7 SHA-1: 21998b7910a39e8f9e1e402c655f2b9b82ba35d1 SHA-256: b01ac87fe916284b7d4a6f8fcb6d511cc914da24932f4b6a90629cd7ae732c54
174 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure to direct users to malicious content or phishing pages. The presence of an IP address literal in one of the URIs further increases suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6736

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/bda15c329d40ca388eec0698f9aff7f0/95350413503.pdf In PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/3f140dcc8494015ef4ef92fced352ea8/73723617654.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/85733570805.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/24829900198.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160752344b96e1---14167938859.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/eef59b891a5d5b8dd5f237f03a49054b/daramuroxukenebew.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160700b379df4c---jasewalan.pdfPDF link annotation
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce3e0e5b140---31865017867.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160905d010e16b---zazuz.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2c4d02601---zudimagejifu.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/92765769902.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/169a0a3f554a2f9cf1b9d9043588b7b6/67202795375.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/penexilikonit.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/in0h9g1njcimqjul73htij0dtt/xodojatunidu.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-6-20/20210620005948742164.pdfIn PDF document text
    • https://yellowstonewildlife.com/lozoperafexipeparixemet.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/begitaruvodu.pdfIn PDF document text
    • http://funperm.ru/content/file/73469110106.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/warokaki.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a77b71649ec---69222818117.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd9918b657---zujuzogejezoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=geography+questions+and+answers+for+competitive+examsPDF 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_off0000daf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF303 17548 bytes
SHA-256: cd9661849f50b376ef530c6678455cfb52050b774f6879300e2ba7fca5ca637c