Malicious PDF — malware analysis report

Static analysis result for SHA-256 65d3f8e33df7f972…

MALICIOUS

PDF

82.8 KB Created: 2021-07-13 00:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d13ec1928d851c9048cea1972550ed3a SHA-1: 6fb83a4a859f2e76bcad0e43dd43829c8e8a2ee3 SHA-256: 65d3f8e33df7f972ea3c10880a339cc77af0a3816d37e28b48ad0b38efeb7332
156 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or malware distribution.

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://garglob.ru/uplcv?utm_term=how+to+spell+david+in+spanish PDF link annotation
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/lou6p3ma6e7q6asq2glr8lr3c4/16382245047.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d05f16aa68---4700367295.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/3d68dc6407c2bfcef8a03b31abe19da6/24937091208.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/ae3d9e7fd13a6c439c2bd7e7a46bc7a9/29784912380.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/46005770071.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/je0akodqvfotj4vnrd34rle782/zakemadojivipuli.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210626040053.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/dopinepegatunerimojubun.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0b3c145e3---95404048391.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/kedevanasifujujokegotiw.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/vefodojadasupeguvukanezi.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096bd59bfd56---xolofemur.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/pizimexexutefezokazemej.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087a64d47c44---37191411310.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/99996580394.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430201520411720.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc8f8a268f---votipu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/4ca5176a03ff72c57513a63ce5fe2f7a/93041074486.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e8c4900b9---93946289911.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607af6985b2eb---nidefesatizegizepugadume.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/36847932958.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbfb33faf7---rulafe.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/20225987991.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/86855641985.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_off0000dfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 18164 bytes
SHA-256: e51c0227502d408252f036f393b284b881f2073e861c4a4c9f419e7a0f952493
font_02_sfnt_off00012621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12621 10532 bytes
SHA-256: 4cb8b9feea9bba33be33b4bff6df4a98f654168b19e5c1c6ec03e3ffd30774d5

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