Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6696c167e89324…

MALICIOUS

PDF

92.2 KB Created: 2021-08-09 03:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 239cc99204a03f32aa9bec597d146b5a SHA-1: 227f059b11c626145a84e5f4cf2107e9869ffbb4 SHA-256: de6696c167e89324c5bdf0c8e5503fa06b166ea90e799b9b1ec3614ddce29c0a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the PDF's structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://jagatjyotischool.org/jagatjyotischool/userfiles/file/nuximowefazivesebidorow.pdf In PDF document text
    • http://thermcom.cz/userfiles/file/29329867717.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/dujosalufonefejodutaz.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/64036558341.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c6be730c88b---maxelosugenedutezuko.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kuwewumevuxu.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/43020748699.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b262bf46b0bd4ee235f1f5de76fcb57f/vevasejawagekeleka.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/b02909078268f7d431180e6b9b2611ba/99394336048.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce6776f17---pigenagevepapixubomobu.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/97623579448.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/c08b9a5773e0304b08f7e0af0a3dfecb/44576614024.pdfIn PDF document text
    • https://remini.hu/userfiles/file/81785745884.pdfIn PDF document text
    • https://amatnieks.lv/pictures/image/jemifedikefisaner.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/2c2e4f2f0cc1d961754c4b913440dc48/65306739297.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/9fe50e8f02fcb7f44b0a0da32ecb9d8c/sebenitopeni.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/49823014485.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/zexerubobifarif.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/72138351461.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/537c626fc8c472be18efa2cce9f3cd5e/87303518400.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/lagavubufafazitumidija.pdfIn PDF document text
    • http://a-daily.jp/app/webroot/contents_img/files/93530120569.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/vipiruvivapuku.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160774673ed1c2---85297380674.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/54807037701.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/molufivovubibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=prof+dr+hac%C4%B1+bodur+g%C3%BC%C3%A7+elektroni%C4%9Fi+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_off000100a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A4 11736 bytes
SHA-256: e0a8b8de28304b0b4162df8033490d8a5b34e4ae0cf804602b11a180285c37fd
font_01_sfnt_off00011af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF7 18748 bytes
SHA-256: 176cb8b029587e5008e0d8308d467797d3a0290fb2c420d940fbbb33f0f7bd3e
font_02_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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