Malicious PDF — malware analysis report

Static analysis result for SHA-256 c978bd5ce1204bba…

MALICIOUS

PDF

87.2 KB Created: 2021-09-18 03:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc52acf9f456c358071b65bfd9bffdcf SHA-1: 9335855d2c3d78958085a6723e7b868ef5d56d22 SHA-256: c978bd5ce1204bba12bd79b76534a67915567ce2e8f7e7de627e7e95f2867d24
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cabini.it/userfiles/files/vaxemowowilavoxed.pdf In PDF document text
    • http://w-f-l.de/user_img/file/naxapavobuxugawamezoka.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vopozukupebibotu.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/vulokafafalamuruvujes.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/26275875443.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/wazepusuv.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/piranatojerorolorewugete.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd4bd748ed---76293181105.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613998258ca88---zokepumomosa.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/musabefejajalapubo.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/3af081c1abad84a663ba0d1268a3d01b/jojoxovebizok.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/menodusezovuwow.pdfIn PDF document text
    • https://everestart.com/images/stories/file/mununikewejeseruxebij.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109021407561474.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/viwirumonuwesiwaganakoweb.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/19539340593.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/29006230322.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fenuraxemorixumulidalot.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/87714398351.pdfIn PDF document text
    • http://lse.hu/userfiles/file/61755924262.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/zisekifubotijajupogozoto.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/zuvorabu.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/kuxitepobevafin.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/14296498503.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/84771128742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=build+a+boat+codesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 10452 bytes
SHA-256: e9094e0467b9dc2ae2880631d5cee1c3ac360a714f636287751ff4834bc1f129
font_01_sfnt_off00010942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10942 17920 bytes
SHA-256: a3a378698e566713ab205016e1d9990cfe2efc20dc556fc6aa63b3588fcf6e05
font_02_sfnt_off00013711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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