Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49aa7e60824a227…

MALICIOUS

PDF

85.0 KB Created: 2021-09-23 22:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f93b847bb56d3973344a9f69b173b48f SHA-1: 815ed7eab7bd31b2130351e31df2ae52869aaa65 SHA-256: b49aa7e60824a2279b0491a7cf259ceee0fa9be5c3917e7cc2b2e6dc476cdc89
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 CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://atreve.eu/ubezpiecz/obrazy/file/vuteripifulow.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1fbbdde55---35231703548.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/29333270463.pdfIn PDF document text
    • http://idcla.net/upload/files/89487281912.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137048ae26e1---98343317768.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/6699739438.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/33549056357.pdfIn PDF document text
    • https://subarini.ro/mm/file/87661598526.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/nivajufipulijan.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/69564774949.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/sazajifodoxafamap.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/jiwozukazilotez.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/kupad.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/26888848256.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/3747331750.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453f7ada316---16253737751.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/15027142214.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109070037183690.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/fexonofaxibamav.pdfIn PDF document text
    • https://iwistw.com/upload/files/61984560218.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/43498797368.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/bufumebezuxojokenemonep.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c830d3cc---pujedulebudelilakevalowu.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zujokefi.pdfIn PDF document text
    • http://congtyvima.com/images/Download/dufibutow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=fun+game+androidPDF 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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 17824 bytes
SHA-256: c3ea85d5012324ab1ad1a7387630ecaf6a266e1bbd4110d131ddd41d35b94eb3
font_01_sfnt_off0001176b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176B 10356 bytes
SHA-256: 3dc20b500029659229316ca0cb49ad8b879f340fee59ed7fcb72ae9a325b94c7
font_02_sfnt_off00012e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1