Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6668810688fc55…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 15:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 04b1f1a24fab4f3ede1dccd380191847 SHA-1: 64f01a0a21c28b63a9365f7e5edef7865be1e824 SHA-256: 5f6668810688fc559e53a6985bdccd6abe7c779ece017a5477ccd3004dc8ad0c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://irlanc.ru/uplcv?utm_term=male+real+doll
    • https://digireg.cz/upload/finedeminixiwixo.pdf
    • https://tskrea.com/userfiles/file/48122267903.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11490709f7---bolike.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/gevozuwe.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/9067f618d1a1ea9d1b96b3a3d0db0e8b/79299701533.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1255d9c996b09c103e99634313d83a27/27926346185.pdf
    • http://phrabat.net/UserFiles/File/93714102722.pdf
    • http://scheidenschiedam.nl/uploads//file/85076945358.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fi3e7r846fa88r940r75v2qg22/50105206306.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/84l6v3lnirbtk536l8d0i09jr3/30803617740.pdf
    • http://megalaserasia.com/upload///72018845061.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077aa96c8732---57902820950.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081268ac9e3d---gabasesifukabaregak.pdf
    • https://alrukn.co/userfiles/files/2655834530.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/7c39c984aa2b6892cc95c8177ae704ff/35425167902.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/42ba55f8750d836cadd7bb52e16babce/mivilikugenef.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11558951d---panezujeratabofivesavabo.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607e48da049a9---75039829018.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/0d9e6a9f04905d948e2df057cd9ecc49/86491145045.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/i9jlho3uilcagsf7vp2j3hkmsi/36367106332.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c473712c7ae---98096180371.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c888b26b422---ravivitebeburuxulov.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c644f92ddc3---27390559268.pdf
    • http://creative-format.com/upload/editor/files/dorowole.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e866.bin
06f175ca6c8bac159567f3576d6cefa6984ff28487f92abd7b518d5f3f7db677
pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 16976 bytes
font_01_sfnt_off000114e3.bin
a29420c6002d5b24363e179a35a37610c78654b40c583a82be14e696b8a8febb
pdf-font-stream PDF embedded font (sfnt) at offset 0x114E3 9772 bytes
font_02_sfnt_off00012a5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5C 16792 bytes