Malicious PDF — malware analysis report

Static analysis result for SHA-256 615437e9de2a5521…

MALICIOUS

PDF

89.6 KB Created: 2021-07-23 22:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 910a20b5c27bcf5de547bdc4b715634f SHA-1: b6a4900e9f5ea04d42dec390048701458f38fc6c SHA-256: 615437e9de2a552187febd4ff02b32ed4413dc7c6391b6d0df7fa3ea11ac3331
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://bukvoznaika.ru/ckfinder/userfiles/files/1952399659.pdf In PDF document text
    • http://studiogallerani.it/userfiles/files/vikadopaniwefok.pdfIn PDF document text
    • https://kawanmto.net/contents//files/27375383430.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/medepijem.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/64042932848.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/b370627280244a2e2243d50cb1acc577/51011032950.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/qa89g9cltiahrrs5s9ftme74s8/zonoriw.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf084e5f98---ramekerurebutax.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b12859447---nevuvoxokafijebava.pdfIn PDF document text
    • http://giaoducvietnamtv.com/images/ckeditor/files/piwitadazukoleguvew.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b06997897---wadovepopemaponij.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/d13614c8a82b8aa74a03d5dd6cb5730b/tonozezu.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/fda4ce543fdfaf8f10e48809c26e642a/figiwurux.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/73640617701.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/rewetaxoregojo.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/lffnptnk90tr1rs6omltatjn00/lizowifavejitupu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/363d13faa20cd9b35f14730274dac212/vafugubutarexuzojenuf.pdfIn PDF document text
    • http://jaika.in/images/documents/files/tefid.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843eee896f0---97029345186.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/xojudewanijanawiwupop.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/761sr3ir8lv0nl2plq5099fuu2/47564753205.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/gekamewivozemesuk.pdfIn PDF document text
    • https://yuanfuconstruction.com/ckfinder/upload/files/duwenobujososokuzazite.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+much+does+audi+e+tron+suv+costPDF 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_off0000fa29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA29 17316 bytes
SHA-256: 119f83cab0ce1ed17d55e50a8e614c8d974fd78ab5d7df6f66ad2e7f555dba33
font_01_sfnt_off0001276b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F82 10832 bytes
SHA-256: 6561a56d385d74e9cc35699877a1392472e022bb0944e826e3228ad76c298206