Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c25463430ecbe39…

MALICIOUS

PDF

75.8 KB Created: 2021-09-14 03:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d4ae2ca593774b67cf4498461e0ebde SHA-1: dd475a351ed1b2092db8e7db938c766765319872 SHA-256: 6c25463430ecbe394731ab9d5e5c9bf21bf6ad00a5520155f28b4fa3e109a4a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting it functions as a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate an attempt to lure users into potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=marathi+serial+watch+online+free PDF link annotation
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ff582a3ea16e4e834c7b9f841ea6278e/76748956471.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/jukete.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135953e68e88---binukazowebobaja.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/welojepavero.pdfIn PDF document text
    • http://medianet2000.net/amm_prod/image_news_popup/file/tufexukog.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/23099997500.pdfIn PDF document text
    • http://irinabailey.com/upload/files/50699935234.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/fd616d591d0d8f30a1d083752337fad2/pobewobuwejatokab.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/62213873994.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/81219881000.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2b67a0ae7acb89eb9e375edec2b433c7/50965292664.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/rumapajulufasovuzorovorim.pdfIn PDF document text
    • http://ricettebiagi.it/uploads/assets/file/zamuxavisadamexanosubuku.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/jazajixotok.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/98390960109.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/25477924106.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/7885268538.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0f9vu7fsokpht4qev9vbc2kesq/megoremasozuvilifomusam.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/setomudokavelo.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/75530113433.pdfIn PDF document text
    • https://claudiodituri.it/uploads/kokakedivulowito.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9860c9e8d---52734292330.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F8 10512 bytes
SHA-256: 289a13971526c8646b9357b91845ce51c332058e50b68c8faa1b289cdee570d8
font_01_sfnt_off0000deeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEB 16620 bytes
SHA-256: bd1a8895066e09c70be6b4671aa545c4a6a96b869667d995bdc178b942c4a9b0
font_02_sfnt_off000109fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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