Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9f272555be2d02…

MALICIOUS

PDF

62.3 KB Created: 2021-09-07 10:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8e5566ef5e8d4bc18f850b2a135aee53 SHA-1: b95aaf7b8b61043c1598412cb2674f6d7409ecd8 SHA-256: ec9f272555be2d02fdc121e290792145c0085d2792213cef3e6028ad0835bdd6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicates this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9389

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://aquamedicasatumare.ro/ckfinder/userfiles/files/53502438054.pdf In PDF document text
    • https://watertorens.nl/userfiles/file/73816849840.pdfIn PDF document text
    • http://e-hematologica.pl/users//file/valotepakiwisubo.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/74597001223.pdfIn PDF document text
    • https://energooptima.hu/upload/File/zedosadebo.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/96146461397.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/barorolomaduki.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ad481a11325e7566b12407a319e19250/kovezive.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8472e6b68---8631013910.pdfIn PDF document text
    • http://dfh-consulting.com/userfiles/file/99251943956.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6852c87ca---57435110128.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/dubusamawivaridudar.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/jjbmas8vd8tm7aalt88uj2ag36/pijonufixubum.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/bepamepalemetaxixizomabux.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/tipozudakisojadesud.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1cf6d4d17d34dc2ab631e3661ca75500/79576112869.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772ea0097c---zinidojodogixe.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9e60a121c5---51945335869.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/90771936815.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608417bc64d24---38036081484.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/tejarabiwesufinijuwol.pdfIn PDF document text
    • http://smiletoursvietnam.com/ckfinder/userfiles/files/25473033760.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/xezovidibiboloranuxozudub.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f84e6486b---48816127664.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/6fee4987600f30a96742973c471c260b/tezetapoki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=science+equations+and+formulas+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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