Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f85965bd89fe93…

MALICIOUS

PDF

76.0 KB Created: 2021-09-03 13:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2701d3e3188a8edb6555bb9c84e8fa7d SHA-1: 97c757d443bef6a3efc25993dd35c4dd77df69fa SHA-256: 56f85965bd89fe93a61849d7ee701d09a37708cd69aa0396c1c0d5fb70888bc0
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, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e53df0e1332---18725536337.pdf In PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevizodefepuwezajuwogo.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/15338101290.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2ee0d0b4b---94404734868.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/2a7b953a84466dc6703a4f4a8d0a8121/resujefutonajovuf.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb48ea1e14---61746490963.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/82666761296.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/54550336963.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9a3907bf6a9518cf73065abe4dde7af7/91303510464.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609a95e3436c3---20600827098.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/49c59d6aacef138603f52e12532a2467/nojupoxa.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60b2d5878d---waketelajurik.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/35381394689.pdfIn PDF document text
    • https://harom.ro/files/file/89593928538.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/nenevasuxuj.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07b987e508---6386366026.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16126634276ae3---sizavoguwovabute.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608d00fb6573e---35231383722.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/guweminubebobobimilekugo.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec96e4c7e5---nujogike.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9440aeab22dadb8f7a0f100683ba6138/81897918913.pdfIn PDF document text
    • http://clase86marista.com/clients/25276/File/68543605018.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xopowukaridaruvefirafeb.pdfIn PDF document text
    • https://ayurvedaemart.com/uploads/file/lazowonudekavelix.pdfIn PDF document text
    • https://cuatudongbinhduong.net/uploads/files/pidinorokuzefipax.pdfIn PDF document text
    • http://nineslash.com/user_file/file/9199578101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=chopsticks+piano+duet+sheet+music+pdfPDF 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_off0000c50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC50B 17100 bytes
SHA-256: d9d51fa57756563c2140833bf3bdbd094fe3d8a6010ee2e81b74e87aa88d6194
font_01_sfnt_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 10964 bytes
SHA-256: 2a376d50a8f23724955a52525567b067a1a1238855b30434e7f7ab74a994d501
font_02_sfnt_off00010a26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1