Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa7b9a564e7f78b…

MALICIOUS

PDF

64.0 KB Created: 2021-07-22 05:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4851c39c3aa375623db366abe57ece62 SHA-1: 925866a229cfa886e669b65e6f8a07a14b9a58bf SHA-256: 3aa7b9a564e7f78b6db1a434f67642e3a2d2011193b4e2e907e5f7804b8c2740
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other domains, suggesting a link farm designed 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 an attempt to distribute further malicious files or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7669

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://bonacorsi.it/file/29174741522.pdf In PDF document text
    • http://robbinsfamilyhealthcare.com/clients/2/2c/2c787fa606fc56c3a3a24dfc5409695f/File/31780243064.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cd23cd107---bulegejidewen.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/18496549410.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/18908318533.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f13ca600ee---45052753724.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/32626782396.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/3883610528.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a63bcace1---nisujisubomagupilezopeko.pdfIn PDF document text
    • https://atrax.hr/files/vovuzop.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b2624a586---bowowur.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/wowaraxogusomo.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/6e3qs4cum2r7j2e71ndmjrjh16/sapovebexez.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/78058560054.pdfIn PDF document text
    • http://wohingltd.com/userfiles/71136656786.pdfIn PDF document text
    • http://www.polni.si/Images/files/mosidibez.pdfIn PDF document text
    • http://drironcat.com/images/file/3587169731.pdfIn PDF document text
    • http://short-story.ru/upload/file/6290265734.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771d6562a19---paxazajufisuwuw.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/perudavutalaxumezilut.pdfIn PDF document text
    • http://fruitsad.pl/images/file/17916333879.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wuwokunubifukamobesud.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/11347311722.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6059be9ca---68210189696.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-19/20210519002645405820.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/75v416egl0dfvv9q5abv2ct40a/musopiwixawavogitexoti.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/vazijapewezunolame.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=coughing+while+eatingPDF link annotation

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