Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bd78d057fa909e7…

MALICIOUS

PDF

137.1 KB Created: 2021-06-30 06:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5aef7381fbdee401ed02faca9db0c9a6 SHA-1: dcd89fae205e9f872dce066c78b5cb95fe09138e SHA-256: 3bd78d057fa909e740c9396e7f301fd17b0502454b777423fb4171d8578edb89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9843

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://ketchas.ru/uplcv?utm_term=connotation+of+pilgrimage PDF link annotation
    • http://posekatzahradu.cz/files/file/vurimodudizefulukalixeli.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7232960e2bb6ae544f62ac2910dd8967/89955604552.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b0889851f31---37147064649.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/77362836466.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/juraze.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/92886687314.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec1a702a27---97460879829.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/jh5vi148i0is9min3r1rah8ag7/paliwakigoj.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/befufugetopaxotewomo.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160aa81e791078---90227180698.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/26374139764.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/90975ce5a78217f9e4171660cd0364da/juridiladupurilelo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9b278c1ee7676cc7ed42465699fef53e/15595147660.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/1sql71dvnefb07gnjs2g290mu5/7212492089.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/pmuctnk72mf6hss0icfdr2noo5/riwawo.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/jezuxutukebafeba.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ri9jihm3p896h00kgus8qc4tqq/soriwegetuwufile.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af4c84a4d---66645318382.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16079fe6a68ce9---sutebamigavi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793638dd593---76031766568.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d496181747---94970523784.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160be27542cf09---36896523383.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/70068100501.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/d70a8ea51f1ad739f538cb8d3edd456e/68537012259.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a92eeaf06a---resuvasazakalogogidofijox.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/98083044299.pdfIn PDF document text
    • http://tasteofruraleurope.eu/upload/File/fabolewodimejolozow.pdfIn PDF document text
    • 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_off0001b950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B950 17744 bytes
SHA-256: 86723b8c7a3fc3e6e1595db06cbc333dac507564b1419ee0f3dd366417077d0f
font_01_sfnt_off0001e694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E694 10564 bytes
SHA-256: a4cc3de0a99d904215a6f84e50a6fd9f4da94b26a834b94464c50d05ab7a6883
font_02_sfnt_off0001feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1