Malicious PDF — malware analysis report

Static analysis result for SHA-256 99a19ddf836b6567…

MALICIOUS

PDF

86.6 KB Created: 2021-09-03 11:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 99ab9610394f9ea206529b19df878882 SHA-1: bc2244afffd5eca6337b6a6abb6606ced60636c8 SHA-256: 99a19ddf836b6567f0d230d166d46e6a977a331c6f9e393e26adee30a9e2d869
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall structure indicate an attempt to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://edu-mate.kr/_UploadFile/Images/file/25941503720.pdf In PDF document text
    • http://beiwendq.com/data/attachment/file/71425616666.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/1d73v437pia3t3uf49qm06j2h5/tetogixeluginapanez.pdfIn PDF document text
    • http://mq-water.net/upload/zitebiz.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/xorosutupanopalu.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202108181547467418.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/bagowizorus.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/80709802103.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/14299529372.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/gosivazorejotadefunagowo.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/08/files/210814100639.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/42481599669.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbd3e18866---73000684405.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608558988fd95---nexekokuwofesifozi.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c975612b6---zorogukuxa.pdfIn PDF document text
    • http://strandedtattoo.net/file/jororumibimimave.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/aa3777f148cbf1494c87410fed3617dd/30946849326.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/38329112612.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/nadejesiwekimapaju.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/ntmej56gd8feckrhl2sdkmsfm1/vatogewogenizuv.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/55252201174.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b48866fd2c0b7f7a1ff72df900783687/66124526590.pdfIn PDF document text
    • http://partnercable.hu/files/kafasimelopefekugaped.pdfIn PDF document text
    • https://discovery99.com/userfiles/file/42529535849.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/726819d0c347b1e6528b2958e0f2d42b/sujepekusalivoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=worksheetfunction+excel+visual+basicPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC102 10928 bytes
SHA-256: d7a6ef93b6ff48ec63be1d941b80722cbde8e526d23e8a5f2e57c72f6035a767
font_01_sfnt_off0000da53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA53 16496 bytes
SHA-256: 6831b4db11fc047c79af3d66c660d54eaf612d2c94ef6f85a8adfef97abb4f11
font_02_sfnt_off0000f166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF166 22968 bytes
SHA-256: 7b15932c8a609e8eb02f2fd572157b0d9198e49f347c9706c07cb7e87a19baf7
font_03_sfnt_off00012a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A96 1884 bytes
SHA-256: 86f0349d8856d28c04ba828e05ac4776287c631a4461064e5ef01294f7eec0b1
font_04_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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