Malicious PDF — malware analysis report

Static analysis result for SHA-256 c54b1c5a7b66c1b7…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 15:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4e077f6936e0ddd32605f2831d98411f SHA-1: dbf311b76994733c85c98d4838f8aa6d9a177533 SHA-256: c54b1c5a7b66c1b7902c4113559f3c6fb89adeb745ca0837f6f3d273b08825dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The embedded URLs suggest an attempt to lure users to external sites, likely for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://bluebossa.pl/files/file/36793014117.pdf In PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/6566620704.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/1d80189e832ec56fdc1b5b2e0361e99d/nigupurijugokujezijerolaz.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/nu72r87va9dp70vh1bv3lipcjf/32369422095.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/lusetomeviwuxox.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/wezujalosebujodojebu.pdfIn PDF document text
    • https://cet.sk/res/file/gagizerajisizezoxoba.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/18434928767.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/pekexuletu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16138cae11d733---suxufujib.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/wokivawov.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/76591717150.pdfIn PDF document text
    • http://hytechcommunications.com/userfiles/file/mupumubegirakubevorozamid.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091104001970.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109041555432586.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zesalotiremolopezuzused.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/rapigibudubejimapoket.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/54342471748.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/gegaxa.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/xixakalekukovifuwufas.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/lotubugigusaxabavukave.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/sesobuvaxiwigitegew.pdfIn PDF document text
    • http://davidhammerstein.org/ckfinder/userfiles/files/dilijivuzimodup.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/fujefitalusopumevanulog.pdfIn PDF document text
    • http://dsagco.com/Upload/file/94005742444.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/batovugimutun.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/fce5669382608e8bff9e46f11a86afbf/71400590437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+daily+vpn+for+androidPDF 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_off0000dcc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E0 10360 bytes
SHA-256: f3cc91410bfa24db3fcf689a66ebbd907ab9f0fe649358bd51ad6465f9eed3b7
font_02_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 16900 bytes
SHA-256: e7e6830844e263fefea733cb75244c042fbd03f8e8d024e5a25dba4e51076286

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