Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00f5d3b638f3a1c…

MALICIOUS

PDF

68.2 KB Created: 2021-09-20 07:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6fffe622de3c6cd1fc2aac8fe131189a SHA-1: f4337f667a5a1c724ca760de99de6c1200a8871c SHA-256: d00f5d3b638f3a1c0732745d80b45dace0f87879c0cb929c93e4f442cb522aed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript indicates potential for exploitation or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • 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://stressmanagement-karriere.de/userfiles/file/16225004797.pdf In PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/73473056420.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/24708334995.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/10735299876.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/digexunajubusisig.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/0696aceb77dd78842f07c4575896213d/11097575614.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/somajafari.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/magukafi.pdfIn PDF document text
    • http://bndweb.nl/upload/files/46773871786.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/36477836628.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/48005005401.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/lesutotodejemezisi.pdfIn PDF document text
    • http://balone.net/_upload/file///vulovuvavugugi.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613125da7f1d7---16053332543.pdfIn PDF document text
    • https://tepatsasaran.com/contents/files/nebaxuwigi.pdfIn PDF document text
    • https://ausztriasi.spawellness.hu/upload/hirlevel/files/32711608847.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f01d97b012---xixulimabivixujinunewe.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/39829748765.pdfIn PDF document text
    • https://cet.sk/res/file/58894737344.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/xumojokijo.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613722b2398e0---68041726759.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/33102115103.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=free+robux+2020+realPDF 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_off0000ae52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC669 10200 bytes
SHA-256: bae978393509bec32810c08a18bc276ebbcaac2fb8b3d3e1c34df68bcc846ee4
font_02_sfnt_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 15024 bytes
SHA-256: 944e8bff23db0b687279807feffab562f23ebd0009549d862523d5b895589efd

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