Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f38bd6c3697dd58…

MALICIOUS

PDF

86.4 KB Created: 2021-09-16 12:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c76069123d8973baa22f57eb88a225d8 SHA-1: 4289cb9a42432b5808ee2520992377298e82a03a SHA-256: 2f38bd6c3697dd58230e9f5fc29821c7c0cf7a05b7c4ec396a15bff9e52a009d
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous disposable domains, a common tactic for distributing malware. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to provide a password for an archive, a method to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://89928386.com/uploads/files/202109040936301196.pdf In PDF document text
    • http://wu-pao.com/upfiles/editor/files/jedubizid.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/fawinebizuvipunuwedidere.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nonuwitefaxusetaj.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/jagonupeve.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/87308769629.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/69363216462.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ea85ef09---65204688246.pdfIn PDF document text
    • https://vitanov.rs/files/lakixegomelilidonuguve.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/46786940369.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/98959941378.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/zinirategibajoz.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/linifipofilu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/9c6cd48674b7cf27f04a892ad256911d/kutomidevukuxatir.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613beac7a2ca3---89225744744.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/namifagotonoloz.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/fitegu.pdfIn PDF document text
    • https://successalpha.team/upload/files/5999981600.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/patefogo.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/56454996044.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/dipivoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=wifi+magic+by+mandic+passwords+apkPDF 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_off0000e7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C5 11112 bytes
SHA-256: cf90f8b9308e291e46906bdbd8e013b305ab816ee95e8e4ee964a6235949daaf
font_01_sfnt_off00010152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10152 19248 bytes
SHA-256: 6eb2631fc75f70ec07ea2fe1a7b4b0ba9d210845412b8d74642156858cbb3045
font_02_sfnt_off000133f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1