Malicious PDF — malware analysis report

Static analysis result for SHA-256 357e3b8b22334ef2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-15 18:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 87486497f6239a6f26e05c84ff93d6c7 SHA-1: 4e5d49273d28deeef5c557638cb08d7d3192ca57 SHA-256: 357e3b8b22334ef23133be3c482c10112bff9ad440669ea18069b31cd3d7b99f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://queure.ru/uplcv?utm_term=can+u+change+imei+number PDF link annotation
    • http://moestuinwebshop.nl/userfiles/file/bapikusagukawelu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/5amgfdgof09rlns7nm9b2dkrk9/seluga.pdfIn PDF document text
    • https://siroyensao.com/upload/files/zadenanodigusepufobosod.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/xozogemefilifobi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133845430946---jifitusefixopafozu.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/m2lk59pgtr8a8bn9d9aa1958ij/35246842055.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb40190740---xuvolonefubagimi.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/42154807854.pdfIn PDF document text
    • http://zenithmetals.com/files/bogariz.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/20420384426.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6299978a---53519654210.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb2c8503f---zonoxojarisuwun.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/20539622567.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e78c8524b6---24001632862.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/jumukuli.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210912_F86CC3DDD805D647.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/60407632719.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/16757964298.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16142016ad3d04---18576542846.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/xifisoniduw.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/92631194413.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///gibesesubi.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/lanizozewuvowokeverinapor.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_off0000d521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD521 10516 bytes
SHA-256: 754052276617974103aebed4a3d0a760b6e57e62c2d9b0a45433e6a51d14c4fe
font_01_sfnt_off0000eccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCC 17332 bytes
SHA-256: eef80006fc0c80dc703b4a84a6b26676cf63a4081d40fb31cea0f9597e2672d1
font_02_sfnt_off00011a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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