Malicious PDF — malware analysis report

Static analysis result for SHA-256 839e839ada12aba8…

MALICIOUS

PDF

114.9 KB Created: 2021-06-27 18:43:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: fb596afd4a7c4cee06b5346b3870f69c SHA-1: bcc69ba9c4efa57d4332ae2825bac732cf841537 SHA-256: 839e839ada12aba879ca4ca0779a6440f98c900350400e88694ec9628eec97fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the detection names point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/e4c45fd0de2b6a9edc27149a2f6a77f6/6561040884.pdf In PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/c8508f263a02ffe1cbbea4acbf1552a0/81284045899.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/mdv424mneq4fjts4evogtue2vi/29034052268.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d142e8f69---dogegirixusobilo.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609869e0859ea---873923844.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/7njpasnf81q9dk6nmok4gqrmu6/94145194751.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/vurewogudaferiginenomaxe.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/44124180614.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/jonakozodavuzovawijin.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/5shm9h6o9326to7dgtnk75o39d/loteg.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/23d555477f0d18e2e3c2b5f4e1544d54/wolerepurefufeliwe.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d1e90f6e---26043791613.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609689b2e8558---jilozomilolajomapiduwadis.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/fatixisa.pdfIn PDF document text
    • http://islandpointfl.com/userimages/vaxufipow.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/tivikibedefejejupavuw.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/itt9sa80aq4rfdhkd37kka19h0/32399346963.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/aukmvqjk3a0618ac8sqejbgtql/28960797851.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dc009df9d5b1713bd2cd1610e8699bd0/16686577252.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b088f9b857a---48430631951.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618003509841307304.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ca05efdae---pobeju.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/3323453876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=free+energy+partition+functionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14192 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000159a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159A4 20136 bytes
SHA-256: 8cc0fa44c5b1cae4376b01814ee0e498f30edc203988cc181d7e6fab264e743f
font_02_sfnt_off00018fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE4 10632 bytes
SHA-256: 684351546209ca696aca7ce8ac7ea99e5a28d31ab1a6381f48f0c24374913072
font_03_sfnt_off0001a85f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A85F 16156 bytes
SHA-256: 2be9fc21d464779968742415929fc1019ef03d6745cbecd58f454716c6e4f645

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