Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4b8734a5e14b9f…

MALICIOUS

PDF

88.9 KB Created: 2021-06-27 05:34:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 310a315083128af9e0ef2a10ff68899d SHA-1: 2b7893d2ca14aa207187c0adf97f7171fe72f596 SHA-256: 3f4b8734a5e14b9f6790b54080daf955059c78a26af19344aff07602c6d87cc6
156 Risk Score

Malware Insights

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

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, directing users to multiple compromised WordPress sites and disposable hosting domains. The primary goal appears to be to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c5392b5e278d005af2e237ce7677576/kotasajiliw.pdf In PDF document text
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/nipejefav.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/91080823613.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/vepobufu.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/zamonezilifakuzoronikowi.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/kufobis.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082eeac78ced---babasukubudekezibafo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/55043ac888066ed6e721e9ddd69776ab/61232616715.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/omc2el6fd7noh7ne7a30tcipnb/88989208103.pdfIn PDF document text
    • https://actorconseil.com/files/file/rexavojedajatinoja.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608114422c1c7---fagaxetedowunizesuxomad.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/36667090191.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02d9c5ad6c---52095736186.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160877d98b9864---68741603595.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/b2f41e8881dafc50fe124274bebfb7bd/8384641982.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/c687e116b2845dcbb0a3fe322ac6ce5c/49009788342.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/2096711847.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf699b2595---movakajepuporukif.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/bagijanekirapedulam.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/8rs0mto1qkjs32u6lbupfdhlgo/femazewiluzagiri.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2d83223c3---fukazuvilufev.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/821f21a5ebdde8fd188a780d76f43f0f/89223109066.pdfIn PDF document text
    • https://sealskinz.ru/files/file/nawapuvujipivutarog.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a22401b5c30---gorosakifimopite.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160877bad91cb7---tunaripiranuxi.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc4ac4f149---43800737343.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab0761a3b---99561336343.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a089dcfce10b165098d4362cf76d6e66/zaxepinazagobujanalawuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=pre+production+examplesPDF 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_off0000f6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BA 17604 bytes
SHA-256: eb9e8ba149756386de590c868724c4c17dc08b474378aa43e0dac5ae0e51a378
font_01_sfnt_off000124fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FC 10880 bytes
SHA-256: fbe4090dcf9f0c0a29d46158d2a1240137301f41b9d1979f2a0ee083e649f3e6
font_02_sfnt_off00013e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1