Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b052a5b3859611…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 03:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bf06b26993262445f3ed4ceec7ee2291 SHA-1: dfe934f2546e00caacecf7d4a77227459dd4e457 SHA-256: 84b052a5b385961177ee5c49ec8260cb592b88415187e4bb2ea674db1d542fe7
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=android+abstract+class+vs+interface PDF link annotation
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467e0edbe94---15205794050.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/70855819299.pdfIn PDF document text
    • http://fajni3333.fun4two.pl/uploads/assets/file/samun.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/vuxafo.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/24188246640.pdfIn PDF document text
    • http://dongtienlamnghiep.com/upload/file/fonibodevoxosezuwuzu.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9cc276342---kuwekisuzat.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/19484948469.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142a53f25347---12446952742.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/jusiviremutisara.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16146576d39d99---xapipug.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/17938106037.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/69308306092.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/nijikutigodevexodusina.pdfIn PDF document text
    • http://elitvorota.ru/f/file/lomegunekaxejoxawep.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/36189885573.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/denomitogatina.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/tetofofawofepurimerari.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/xajekadunate.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lonazirurijugoraxup.pdfIn PDF document text
    • http://ukrfirework.com/images/file/telodefixepigubofavigof.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/tizadami.pdfIn PDF document text
    • http://swancentive.com/cote_dor_import/admin/ckfinder/userfiles/files/57587935324.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/kikimagivemoki.pdfIn PDF document text
    • 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_off0000d295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD295 18092 bytes
SHA-256: ecb90ae2fd8285135b831b59c73a5e61726f688471cd0d6c09925be70b0c3a0a
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10656 bytes
SHA-256: 2454a1ee2c15e72d7349bfc2522a2db3fb365c09c2651503c181749ca5be5eca
font_02_sfnt_off00011a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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