Malicious PDF — malware analysis report

Static analysis result for SHA-256 965e3bbbe80d598b…

MALICIOUS

PDF

90.3 KB Created: 2021-06-29 11:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 681ade894a35c7a657e6dce83ebb2544 SHA-1: a42f21af622be24c1ed9735776adcad7348495be SHA-256: 965e3bbbe80d598b32760f4c633c1da9e1ce331f8800040db0054ecd51d60c7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious or phishing destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/558031da4f9be61a58980ba37e2c3041/bitivowamurof.pdf In PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780b63097b---fonekesidibobiv.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/jd8ll1qfdfn1g4kn3ujdq7c814/gufomip.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5rkq8vdanp25e1ed97ign8t19m/jewefazitudejejo.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b94fc3af0c8---vifozevafefibasulex.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/84000738639.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/88917595892.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/26e9cd41cfab1ce266b0a31d441a633a/nebowolimotupigegasegub.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/67510537194.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jvbm4i245efnov3umjjm0au5d5/gavanifumavoludak.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/9683746614.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/degapalowiwilikulu.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/nafatenanajixodozutej.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc097aaf9---68060061635.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098bee720e16---tetoselawifog.pdfIn PDF document text
    • http://ikhmongol.mn/ckfinder/userfiles/files/mogojitazo.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/fe1kj09d8s925jh0vncq10hv5k/11728088336.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/60336794962.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/sazizunikoputugowewi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099c31e44376---guleno.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609147864f085---xogipomupakuzuva.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/d50c98830d790a72c712852ece2fb482/texuneforome.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/e3ivq6pj3r1pfh5mp5qudbbqt3/66751004525.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077959e0f771---47384427360.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ae6583bd---vakixopapiwowidabigabimeb.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/76521836026.pdfIn PDF document text
    • http://haai.org/upload/file/risadobuje.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/5eeef5dcfac53b7aebf477a8bfddbeb0/kinuwubaruxajik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ncert+solutions+class+7+sst+history+chapter+1PDF 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_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 17092 bytes
SHA-256: d9429a54847cf80ee19be9cabfd1ba712cafb589db79da5d3098f758127c1dd1
font_01_sfnt_off000127f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14010 10764 bytes
SHA-256: a960bc58965a31930feb1478a1ef8151fd0d62e4b2447b843881481e8ff077ed

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