Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd8cfd74b98e15d1…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 19:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b30d648db88d2c821aab7e3d0cb64238 SHA-1: 83b6453c75977ab7ff49b970504b70ecc22d12a3 SHA-256: cd8cfd74b98e15d104b44c1badfbb437edec30885010a16b98d38d56deaf93d9
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/mutubogise.pdf In PDF document text
    • http://carbontuning.ru/file/74879541119.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419ae50c8f6---31401713726.pdfIn PDF document text
    • https://scalper.ir/data/files/file/49533160773.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/98871466295.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/26167222530.pdfIn PDF document text
    • http://xn--z92bzy85x.com/userData/board/file/94507199022.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/26961480835.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/20937665179.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/xodakafosabakef.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/52768628668.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/56470384771.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/21741660144.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021090200242380554.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1614143879f2aa---givirelagivid.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/nofagujijitasazif.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/pezotevu.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/52434053079.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/90682405728.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/66773212376.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/62667475011.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/f629f25732bb3d985a521b6e7db2b83f/vuzumajuxemige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=watch+boruto+ep+205PDF 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_off0000ce3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3E 17084 bytes
SHA-256: be65717eec1ba1c687d63fbb30fe9da805028c98fae3bd786e88d32eef0afc74
font_01_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 10672 bytes
SHA-256: f1c61859bbaa79545d8c58ee6c208eb06ca26d0695a74582131f7a31a9bdd8c8
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1