Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e4036c505f6517…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 06:18:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5603e9ac80b4007650d1dcb6f8eb16b9 SHA-1: 19d22e55da7df991500d1982ebd4c84d17b3b36a SHA-256: 99e4036c505f651787b00e6dcf2d6a714b1daf9847d3625d4dfb3a66bcec8d36
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised domains and potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in directing users to untrusted sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613157563699d---75088651138.pdf In PDF document text
    • http://anhhieu.vn/hinhanh/file/petifike.pdfIn PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/94593900669.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/bopepufusabufezoxelonakez.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/99359607325.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/nefeliluba.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/66949582983.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b52da5816---lugamud.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613891d79f25c---70581737305.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/kakuritaduxini.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/sagene.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/37818994025.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/pativovisujisexunanejozu.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/bijapa.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/47476209069.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riximofudi.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/93059743326.pdfIn PDF document text
    • https://ismart99.net/upload/files/77233393003.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/ropifajoboxeniwemo.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/34183151645.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/rikegabuzeruxafifire.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210910113543.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/gamusipafodifavibima.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/61242280543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gloomhaven+rulebook+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_off0000bf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF19 10844 bytes
SHA-256: 1fde59b0fe723b803f36a13c4b572f08b07204d8651e53ac1c2fcc92c401af57
font_01_sfnt_off0000d7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B2 17020 bytes
SHA-256: 1f372fc2fa73fb63aeff84f270beb85d660d57e07d3441f39bd015845133d830
font_02_sfnt_off000103ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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