Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6480dd38c3b23f9…

MALICIOUS

PDF

83.2 KB Created: 2021-09-02 10:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aaacdfb294e3891ac58d220d47aaa140 SHA-1: 97062d6575660f54066fa477e6fd7d697f34983d SHA-256: a6480dd38c3b23f90cf84b78db7aac682cb893e3118190719a9edce9435aacf9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous compromised websites and potentially disposable hosting domains. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to malicious content, possibly for phishing or SEO manipulation. The presence of multiple links to compromised CMS uploads further supports this. The authoring application 'wkhtmltopdf' is not inherently malicious but can be used to generate documents for various purposes, including malicious ones.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://studiorestagno.eu/userfiles/files/sepuwowovezaditozazoz.pdf In PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4f1ab4395c235a4014115d5219745523/66348160162.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cff98fbeb451a89f4a84e6714253f0c5/38633110117.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/sejijodunedodogu.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807cd9afbd1---43608210277.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103027bcf064---2548527720.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/vh2evhhbao5g6cjols7ilfr2h2/44081673022.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee38d6ac2---36439589713.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/takopiworudizan.pdfIn PDF document text
    • http://dachastyle.com/userfiles/file/76364627070.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987a2d9da14---bulemasivave.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1608767509611c50e3293db.pdfIn PDF document text
    • https://www.micd.edu.np/ckfinder/userfiles/files/95789180421.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/37869143528.pdfIn PDF document text
    • https://filetorme.com/upload/files/45749963983.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/3036567158.pdfIn PDF document text
    • http://jadeite.ru/images/file/4555660724.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/d1084434905ed9d73a9c210e7987f204/katonabutupod.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5858cb4c68bc42116ff3368cf0763a41/49199275725.pdfIn PDF document text
    • https://invest.pl/userfiles/file/bobobenizitaw.pdfIn PDF document text
    • https://kueapem.com/contents//files/wijevilanigujisagigoja.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d84a649948a31d26ac91b4b3ecd349be/39056860950.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/25955224749.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/69063893081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=medicinal+plants+list+and+their+uses+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_off0000e014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE014 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 10688 bytes
SHA-256: b7ec0eacd9bfdb9aaa68041ae2204d9bcec48438058a7c1bb2ef6cd48b6d48fe
font_02_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 18116 bytes
SHA-256: 21d7e5d87a8435f9f1bacf6e87d0e967a68baa981ef8a592f00ae7a1c9b7f555

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