Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe6c4fb7e7dc2c4…

MALICIOUS

PDF

86.9 KB Created: 2021-06-25 23:57:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7024374d75ae977a735dc28437336c1f SHA-1: 59d248b6ea454621e128b77e6efe26cd406e3415 SHA-256: ffe6c4fb7e7dc2c480ff43779b2900afbe32f8a217754fccff5f466e1aafe721
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://technok.cz/wp-content/plugins/super-forms/uploads/php/files/03021153ca0c92a79dfd95aafee52804/18554557301.pdf In PDF document text
    • http://lelit.nl/app/webroot/files/userfiles/files/71938134024.pdfIn PDF document text
    • https://tepihtrava.rs//files/xoxamarutafotifu.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e1751091---84204505442.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/fapimed.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/75b77ab40de6da298dd0738bf95fc040/butarixatawuxavodojarir.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/zemajosevodisopetora.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/lebabibuzuvo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b26704d405b---22142299926.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/uhb628r2dv70n4n189bv6p5jq5/burixazoduruvuxe.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a28213b1240---taxalakafufewudipolafatoz.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609340675eec0---17914026362.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/ts22ovi0rkc7jgsj7drn4sktsk/99208393033.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/9872941755.pdfIn PDF document text
    • https://hirurgija.me//files/50075261081.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/12459034858.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/7v2jo4pheua1e4m4f0popp4e31/popelud.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/binovirelonudogarilupoda.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0e3345fdb4069ba0fce51fffee536908/24475178529.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c60673acc90---58291076967.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d6595e97b9---komezobivufegewiku.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/6283d6fe9e415575d8bcac89d48fa2c1/3025996753.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fitness+certificate+format+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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 16420 bytes
SHA-256: ebaadfe027858dc0884b8a184b3c324b4d8d569763ec1f5e14942476aaa817db
font_02_sfnt_off0001362a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 10712 bytes
SHA-256: 1b233523632b151ed9a4f1c31ad0191475236a7b6419b16176ce3dca1907f5ed

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