Malicious PDF — malware analysis report

Static analysis result for SHA-256 83343a59f1ec2d08…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 00:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 051763b91725a211b8b025511170d643 SHA-1: a039406282a107840351a15812be929e7a13e06d SHA-256: 83343a59f1ec2d0837d1e6472bcf35e9839f7d3a05a5de52998d919ee63de4f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple external URLs, some hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://senfina.top/uploads/files/toxiwaneruvekikewufuku.pdf In PDF document text
    • http://posicert.com/upload_fck/file/2021-9-10/20210910012758379520.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/5302803490.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/razabasuwadenuvagenoje.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141feb37cbb1---pobuxunitabedavuwuxisenal.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40267726570.pdfIn PDF document text
    • http://teifsepahan.com/files/file/zavewaroguxuma.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c787ec2f6c---xetepasusurewonodox.pdfIn PDF document text
    • https://domilot.com/uploader/files/55382122886.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/22512658321.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe56f2591b---53180002397.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/sodom.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/tomit.pdfIn PDF document text
    • http://fthyhs.com/resource/docContentImg/file/2021-09-01/189bd22f7bae7799816033d84f43be76.pdfIn PDF document text
    • https://novitas.ro/files/15712795452.pdfIn PDF document text
    • http://brukbet.com/user_images/file/lexapiwusediroju.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/diluzaraki.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/vukadafuk.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/jetodujiganutosoje.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/ruganagutajep.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/16384404944.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/nelutu.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/17513862994.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161345beb3f8f6---vubenuwigaxenutat.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/72087163708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=need+for+speed+most+wanted+apk+obb+filePDF 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_off0000c9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 10952 bytes
SHA-256: 4ce70553df8095b4b2b173ac9aa0b1e3c4361abfe7bc70f287ee239608eb7e3a
font_01_sfnt_off0000e322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE322 16216 bytes
SHA-256: 06d434e8c3b509e0ae71d32d711c3ca973d26caba4e5beaf6a45a005f3ee520f
font_02_sfnt_off00010cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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