Malicious PDF — malware analysis report

Static analysis result for SHA-256 e260ef82fed3f507…

MALICIOUS

PDF

83.5 KB Created: 2021-09-03 11:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4912ea7ad01499304d42d64cd7ad6edb SHA-1: e04f4a061d7bef685a799db1a9afdf84db062ffc SHA-256: e260ef82fed3f50709d2b8e84f66cca768eddea652151dd5b571a463140b8536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the PDF is part of a link farm hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slsnn.ru/content/file/72181736555.pdf In PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/35049f60a23dd699d8b7803d9fe2a7e7/73246485790.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/wizozodalobobijax.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/l5tkovr0nas2ohf366788tmsoa/widupe.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/9lr970gp3hlefft2khbd20jd98/78890884364.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f4b34fdbd---penubotugetifokaboniruna.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/vujevegu.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f8d86e2db---58519769427.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/72282082328.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/41197945214.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/sodakovamugapufijegezag.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/19583195946.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/bumotameveta.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/sbanbj9go54k108ffbd9bsos9h/91666398861.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a890d8261b0---vipeke.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/kikivoselaruk.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/94081603104.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/69105438850.pdfIn PDF document text
    • https://alrashed-alsaleh.com/userfiles/files/pikanejemuxip.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210621151330747621.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pudojojobinapujotuj.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a094ec643a1---dojatuvusegisiwa.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/74888354270.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/10528519149.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210531_8AA67A84301B50CD.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/51228726214.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/tumibuxusavagapukuzugom.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97554148396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=normas+apa+2019+pdf+tipo+de+letraPDF 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_off0000dde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE3 10992 bytes
SHA-256: b31b4ece1e3ccb90f17458d13877c86667b55af67a78811e3534c7765c0a00e7
font_01_sfnt_off0000f77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77F 19156 bytes
SHA-256: 82ef48f244c4d0c8b67a74f7f46533a5edd5a680598323f7eb0bef885c4a98d7
font_02_sfnt_off000127fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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