Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2348726534abba4…

MALICIOUS

PDF

70.6 KB Created: 2021-09-18 03:57:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e8df24679a1a4d37a4884d8c4a959edb SHA-1: 64b65d2ff593a7bb88896874a342beaf0ddfed51 SHA-256: e2348726534abba4bd1d795bfb8361371fd554b39d9f0c534a6a5daa2ad28069
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.peritaonline.es/ckfinder/userfiles/files/53367083816.pdf In PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/6398144321.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/93253976312.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/00303c153c9412d4a6395307a0052af7/mowubopuxamivup.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93a41535d---91758434908.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613681a350b0a---64152325896.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/43852544079.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/18271577297.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/fab15b2767ccdd8234fc932a25ac6101/jideweres.pdfIn PDF document text
    • http://zenkatsu.dk/files/tefixapasagunolex.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/817e8b50dad9f723a42f4e9ec73c61e7.pdfIn PDF document text
    • http://farmaciafasolis.eu/userfiles/files/27374091506.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/muronozuliniremiruxojupo.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/reramexufukanubufefin.pdfIn PDF document text
    • https://expomediainc.com/upload/file/19737158746.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/rezasunuxawop.pdfIn PDF document text
    • https://lecachet.fr/docs/files/lutirejexetabotesasamuj.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/mojake.pdfIn PDF document text
    • http://abpaluso.com/upload/file/3680810153.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/23493199484.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/96715689806.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323965df3a5---2817564433.pdfIn PDF document text
    • http://parentini.it/userfiles/files/85452772157.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bts+emoji+copy+and+pastePDF 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_off0000b3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F6 10828 bytes
SHA-256: 0cb158f2a388c0489c59b2477903751df1de956a0b1d7f8313c1d854a6cbc642
font_01_sfnt_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50A 15540 bytes
SHA-256: 4e08916f4be8b5f357b8034acbffa369ed56923bd9f5860efd059a82ddef3349

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