Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2e93059f8f59f39…

MALICIOUS

PDF

80.7 KB Created: 2021-08-19 23:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 37fe0ad0a8702066df5682679faf680a SHA-1: c00062c9645e940993c8f4bd04ff04df8aba158d SHA-256: c2e93059f8f59f391cfe935672d80579d7167c196df174ee85e0533980098853
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708fb420179---60137479262.pdf In PDF document text
    • http://vrakskodamnetice.cz/file/16570375389.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/7i6j7mld7s5q3nradi1vjbc8cu/zafaka.pdfIn PDF document text
    • http://jmdfhjl.com/fckeditor/userimages/file/nipomiboluxoxuw.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/8243401615.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/kusenuw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609018cda3b91---59854341846.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/jojazuduravolivekigovunoz.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/figinaxiwafuzesinigezefex.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/libunajazomisatuwibom.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c9a5cda8f---xawiwagadupute.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/41068540755.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/48a409a72c2d224c2aa252944ac595b1/tiledotulazedidesotikub.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/jaripofokuluriwo.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/9u69umomo8r91r8ndea23tqg8k/tubiva.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/0dd767e9c8cb42a80bb2b2859583ac36/vemusir.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c2315952437---kunomopinepegijemabol.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/6643262274.pdfIn PDF document text
    • https://consultingexpert.eu/fckeditor/userfiles/file/pajujubodakifusig.pdfIn PDF document text
    • http://jiin-torng.com/uploadfiles/20210727103322.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/lajoxibarirosapugejinam.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/nomomidejivujezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=diccionario+de+construcci%C3%B3n+ingl%C3%A9s-espa%C3%B1ol+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_off0000cf0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0D 11428 bytes
SHA-256: 9457e6c6e30ecae7430647b768f352f5427bb9819550c2c916dbb841ca90574c
font_01_sfnt_off0000e92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92C 18916 bytes
SHA-256: 6e6e385a08309ebc40ca195dd1d819d579313c1a2e2101f499413ace39d3deef
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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