Malicious PDF — malware analysis report

Static analysis result for SHA-256 2391fdb2502160d8…

MALICIOUS

PDF

95.7 KB Created: 2021-06-29 03:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9994a63b29dfdb20167d7eb038023001 SHA-1: 794706a1c92f9462afc394210e85465ca9f674ee SHA-256: 2391fdb2502160d8242e425490901d1ca5ccbd296ea8111bb14d8c0a92671aa3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a lure for phishing or to host further malicious content. The heuristic firings suggest a deliberate attempt to obscure the true nature of the links by using disposable hosting and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=on+screen+b1%2B+grammar+book+answers PDF link annotation
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160888cda3b1be---kigalowifos.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da1c567f6de---tiromaboveperokiwikawemom.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/maneluwokasemef.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/tekifowux.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/938c0f32c7c25b108c69d32bee88e8aa/97847273473.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72050a1e---gijojowewanewujiboput.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b6e62e5bdd4---94794951435.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/35300032990.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afea70d0052---vuberalo.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1d5c9e532---tibediliganad.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/28976946185.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02f0d9379---ponidejojakixiboxajetov.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/dgt1kacfpunduqgvefnmfl9nn9/tiwegigub.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/79127084137.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa56240b1fc---55049197610.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/36d60c0bd4833f2fe7e3b9f037d59796/fitib.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/23877673852.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/39809033742.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/584ec86801d9c63b33f888bd476164f2/posibefigapimu.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/3039616424.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b037bc3e3ca---makemopizurugazoxudanawor.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/83bcad8d5c131174f4a18ed9228b1308/butajuzerelari.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/64750578566.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_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 10732 bytes
SHA-256: f703ced1d1c3053192f28744c2481a21ff89600d2974b6d9b545ea6bf1f1a26c
font_01_sfnt_off00012b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9F 18152 bytes
SHA-256: 88128ef0eb34116f63d04a0afd1743f2148264f157509b3eb00469b8c2b1e309
font_02_sfnt_off00015950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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