Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd316bbdb5421d4…

MALICIOUS

PDF

114.0 KB Created: 2021-06-25 13:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 6c717eb38587b6cc13cf5626b66e0dfc SHA-1: da256baaf42569d49e651acbbb5274ad618cffb5 SHA-256: bdd316bbdb5421d4390fb6779664c41066f8403965aec111ee558ddd1cbfaea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, including one indicating compromised CMS uploads. The ML classifier and ClamAV also identified it as malicious. The document body contains obfuscated data, but the presence of numerous URLs pointing to various websites, many hosted on potentially compromised or disposable infrastructure, strongly suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/b6f4994ad638d269fe0ac0df7d8953e1/22661234010.pdf In PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6ae8a4f31---2745486199.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/56b45d1a51b33079ae0b1cc6075a6eec/4473861525.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/86387263655.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607098ff0d6fb---69418164595.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/4io0ijcr875oeenoph2nmjlll1/58373773829.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/wefimemik.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/7097162775.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9e176626e033fa40f805921a754a828e/fotatunidexatisozuj.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/f1b22f358378f40f1eeda5db11202b36/kubusemapitupalev.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/82296523478.pdfIn PDF document text
    • http://freeski.hu/freeski/file/19889982592.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609464863c44b---57263272178.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/56459958654.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/66321411981.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/77362631816.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=examples+of+fibrous+connective+tissuePDF 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_off00015e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E1F 16716 bytes
SHA-256: 63fab84209083b8974a0d7162a0d97ca6f9da7f2fb8513e8c761ee50084caa8c
font_01_sfnt_off000189be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1D5 11032 bytes
SHA-256: 73fb2ccb2ac81d0330b35d1530ecf272c70ca5735de675ad102092764714f7cd