Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f67259b98510acf…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 15:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ae08db0ab44039a399666f8efbea1d7 SHA-1: 7753e96b0daa5b6c3093eda6e9d564f9a1fbfad1 SHA-256: 1f67259b98510acfcb3c4993d6c7a02527b35aa99e4c3786836b442d99859d22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised CMS platforms. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://landbondcorten.com/attachment/file/6fcad541a9c745e32ca2d5c55cbc5935.pdf In PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608260e36a418---momasutatofetolino.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/nidomibin.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/27071477128.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16112f5f7a19bd---54184037777.pdfIn PDF document text
    • http://mcutech.net/files/lunevefakumodajomagusefon.pdfIn PDF document text
    • https://c-effeimmobiliare.it/file/80439288507.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/juxonalulamivunulevu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115bd157c174---sijidofim.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/romorabopufigegepatoba.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/javatefuxiva.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/75516793063.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/ebc1f2fa61437ce58fbb3b1e53513c46/wojikodi.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/nupadegoxiwetizegajusev.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202108181012036434.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/nogas.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde71bd288---pizadofavupizuwamukileba.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/nuvewijisomefodefulu.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/nibiwegori.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/nabisogojomuwixozuzutolo.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/gorutisagi.pdfIn PDF document text
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/66352393568.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/61863610175.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=research+methodology+questionnaire+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_off0000dac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 11472 bytes
SHA-256: e31e395d04cc9c1a550b28dd3af0af6c9dbe4f36f561fe23507f224f2e011e1e
font_02_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 17116 bytes
SHA-256: 5f9c08b0a32023d0242f2b98c75fff664ca4411d5ff3cdc12838ebba39e0f3a8

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