Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faaf1a50d93beb7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-18 07:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd91170cb08223f8d9ce8d15ea477cb8 SHA-1: 0942eb65227c9c2092726ad5e54f760caa0b6f25 SHA-256: 4faaf1a50d93beb7fa50714daf4701bfef081bede2553111af3759a3c8a55ef9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS platforms. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://wxdyzs.com/userfiles/files/zaxesetuzabagoraz.pdf In PDF document text
    • http://dade666.com/userfiles/202109file/2021091113261570554.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/vuxabodafibabonizixibiva.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/lowanajagij.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8aacd191---37801886788.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/30094714080.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/25502056383.pdfIn PDF document text
    • https://s-oil.hoakhanh.vn/uploads/image/files/gozosironetemibuxiniv.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/79592926919.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/mutosozolezevobuwuputeju.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765c7dceb1---nolas.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136c202d5c17---jaxedawozobafamorubedu.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/14161756455.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/30934030583.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/77694462982.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/47048ef1f203430407c8466d501bc1f3/43367774185.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/nixunulo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145305178259---78161238588.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/88434626576.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/63354272947.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///tiwapatexojixam.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/doxejedunabakasezewolevat.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/sozuluturisonamebiduzep.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/zasibagejorom.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/takisapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=top+10+offline+games+in+the+worldPDF 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_off0000e0b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B5 11168 bytes
SHA-256: 4d8d266d22697463627b419c72ab04ea40d0008105c2b06e07e7e21531b77026
font_01_sfnt_off0000fa79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA79 17736 bytes
SHA-256: 942d5ed278cc7dcdebed51757dc7be8b80201c958d750c84aaf2450f4356811e
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1