Malicious PDF — malware analysis report

Static analysis result for SHA-256 574d8e04bbab17e9…

MALICIOUS

PDF

84.2 KB Created: 2021-08-19 14:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2a7cddbdc14e92c5643adcbdaf409b84 SHA-1: 9d1ff63835b37d8aa530eb63ca083998c41db6a3 SHA-256: 574d8e04bbab17e9bc6460b49b1484e40d422859fa3c8500c957b7cb45f188b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially used as a lure in a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075aeaaa0dbb---pikunuvamibiwuwunuwa.pdf In PDF document text
    • http://yuanhebiotech.com/upload/files/4491287552.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa1dbf0836---25719467995.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/36280735529.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/76692783711.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/223f39650a555250e9b48d949d772eb7/defozojo.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/e9516b1f10d6fd5f1caff8881f1685d4/rotejigufatirexuxilebafo.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/lanubojadalipa.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/47934846107.pdfIn PDF document text
    • http://budka39.ru/files/mufukofegazajumofajaxuvon.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/0ee46ba2dbae5a373976de1cc323af09/zuxinigododunalopesibebo.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/bixurowe.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608897038d262---94534902507.pdfIn PDF document text
    • http://poliinc.com/upload/files/30084415901.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705a2ede1bc---fikoganosapeg.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/37121966336.pdfIn PDF document text
    • http://scpt.it/userfiles/files/soginak.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/49b686960a6e06d87d58808ec044a180/27139714295.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/setuzezivejoxoxovo.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/56146073068.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m5rnukdhh34fb5ljr7qjrgi0v4/55872670696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=como+descargar+pokemon+blanco+2+para+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50A 17940 bytes
SHA-256: ebc7c3585b3dcc62d8b9e4752e6d908b2237a1354822624357f4e8ec36dbbb14
font_01_sfnt_off000102a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB0 3120 bytes
SHA-256: 63d5329265fa66f31317675e0fa273fb9e7ad5c9525a3d6739324c30c534e186
font_03_sfnt_off0001277e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277E 11052 bytes
SHA-256: 45e619ddb8a4abfca06707d343b2cadfc85e5f530ec180fa9effb159f0afc6b9

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