Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0de1dd00b85a42…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 01:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 30b51571f7f92058626160718942e269 SHA-1: 10df67f6cf9af3d1fedfab856c3eb78998603a57 SHA-256: 2f0de1dd00b85a42f7249349b2b568c9bfeb27d52da8afc9485b8fb846af6965
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and the nature of the URLs point towards a tactic of using compromised infrastructure to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • 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
  • 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 https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f182105aaf---31387569392.pdf In PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/tokelufanasutalajatezek.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/kuwakabi.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b53730b9f---8992488770.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/xesefefiwojogudek.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/ce31570ce620222c194667feac14c921/95099931606.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083a783cf68f---79907611636.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/3kno3ui1lqq8617hmrbnq8kgu7/levaviso.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a487d4d8---varafubob.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/66904198235.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/96149384777.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/febitexa.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/faveferidevujowobenep.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080ad7866d20---fodudaputosipivujuwemug.pdfIn PDF document text
    • https://silga.ca/userfiles/file/rebafuf.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/6q1ekj92h09es3b412qgpoi80t/guxatozipemalepukivifo.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/85590768204.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/24185743146.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607f079e418b6---budugomazoxepelotanenuku.pdfIn PDF document text
    • http://ipllaser.in/uploads/pegari.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/61968000656.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c5d98e194---witomulivixaroga.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/disezaf.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/baligamibimimoni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jurnal+protozoa+rumen+pdfPDF 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_off0000c51d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51D 18312 bytes
SHA-256: 63ec80243084a488af1649397fe27fcdc122777322b3edd0a0bb00bc8dbbd782
font_01_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 10552 bytes
SHA-256: 554a5410954baa00dcdf7f87436318e1dd615df2bf13fa8eba4e44cb66f25726
font_02_sfnt_off00010caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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