Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0a60b558455c42…

MALICIOUS

PDF

81.4 KB Created: 2021-09-18 22:57:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30cc263f71c2a07d9c575d1e478c1c91 SHA-1: e8ec7cb8366853a57d12dda00ee6fad6fe087522 SHA-256: ef0a60b558455c42a57c10aa950a4248f3f7b7928b8e4bdb1616c3324013c3d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to various websites, some of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary function appears to be redirecting users to external, potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://laborke.ru/uplcv?utm_term=section+375+full+movie+download+mp4moviez PDF link annotation
    • http://kxqcgs.net/filespath/files/20210905014836.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/vuwumevogubavixof.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/58866781236.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/gifamokipanobixa.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161432b568eb49---nagoletefinopilonizanaf.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134625f59c8a---jesifumikepadoforun.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/bukafaxigupe.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/vojutoler.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/biwufet.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/88098141001.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a5601f0---fefuvurujefibijanuwuxima.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/27943215333.pdfIn PDF document text
    • http://kdsonline.org/userfiles/file/78807337523.pdfIn PDF document text
    • http://mousike.it/img_ins/files/gemufodanaligopukoxobu.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/53345659798.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/67959704882.pdfIn PDF document text
    • http://alltechsro.cz/files/dinimuxejez.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/nifojaxobevoxemiku.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/981375b26f465541720d2f0ac965683c/3760910765.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/19064854718.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/powikilegoro.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/gozitazipakovuruwakuju.pdfIn PDF document text
    • https://dhesient.com/media/bifominibaledutawube.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/nabizotojovakapagifesovi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c85578d41a---57908034740.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6A0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000be9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000d6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AE 18548 bytes
SHA-256: c11b4ed73da354bfd4f716bdaee442e41b2503a43fff875ce4707fe56437fdbb
font_03_sfnt_off00010672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10672 11332 bytes
SHA-256: d44ce9bcb4dfe95a72307f88b6667353949058348984d1469a3fa276f03dae76
font_04_sfnt_off00012159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12159 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7

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