Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7f740d0b2fe229…

MALICIOUS

PDF

81.5 KB Created: 2021-08-26 10:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b0c22a2dca7c9d7e9d59bea6ee7c0d23 SHA-1: b4c8b39e2476cde88b80cbb171437ed79910b1c7 SHA-256: fc7f740d0b2fe2291d2b293a82f99e6bbd3944e80a83db74b8b8251e7f13fb99
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. This structure is indicative of a link farm designed to redirect users to malicious sites, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zionapostolicministries.org/uploads/file/kobum.pdf In PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/e419d0c9b402844409a97525e0f1d352/newolixupojigexuze.pdfIn PDF document text
    • http://dallaslandscapedesign.com/media/files/midubizigoredatefadodubil.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/38685360801.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/86317644738.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/vositefejutegarageni.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb98a4c17ce---xabuzumekedofilewop.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/a33fb77df18c3057431b285d1268a886/timegiwunimamomiwif.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/44602590461.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86447963189.pdfIn PDF document text
    • http://agavietnam.com/img/files/lejemixokanawujo.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/45192982967.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0f0f146a603c06b93b69bc103758124b/vojurilan.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071270c00f17---merefidesasowewegopi.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/wedorekizanomodafiwu.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/12c3510a2acee40f2c5159736a0adfac/56428280869.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/fepewupu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9410dd9a31---pixujuzixamuma.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/remuxe.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cc009afbfb6d657448b83e32a6ae6b67/66661588903.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d823f2d143ef50d7ebb9b6b10e57ece3/sulumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=material+and+non+material+objects+of+ethicsPDF 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_off0000db69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37B 16720 bytes
SHA-256: ee376a08973f5eedf0f5e6d7fb0dd9cae08a839114b59492f805737bb9733125
font_02_sfnt_off00011e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E86 11004 bytes
SHA-256: 8c75c02bfc9fa7c07f6eb6153b0ab594e527b88d0db50fbdfff9237de30b443b