Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5340f96fe44c35d…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 21:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e975b3ef61dea564c5c8b7104f70b3a8 SHA-1: 5fd497c28100d936d372a4507509c9ac0b5c7644 SHA-256: e5340f96fe44c35d6fc9cd0cb09f00392a27f7c80e9b7b780a40042bc3f55402
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of numerous links on disposable or compromised hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f070df9f287---23468414261.pdf In PDF document text
    • https://sanruouvang.net/images/uploaded/file/tenofova.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/9aa3f7473a1603b6d0350c672ed1e5ef/37207527967.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/34452676310.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/cfa3f02d1ddea2a6e990a443d6b7baf3/kewevoxoxuba.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607272db4414f---vafar.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160951d25b62b5---sajupalamanokemaluz.pdfIn PDF document text
    • https://verner.lt/images/files/maxemelun.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e7vrlo6749tgtar4i4cd0q9opc/gimupegolobe.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/24222471811.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb40a26b6e0---75024047424.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/sakazaz.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/mawanovovoteno.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/3021832918.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eddc20712---48774012969.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8701f0b17---78254591458.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/29227153599.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/84069172871.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/87354310618.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/nefatefoxizijapiridi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=addition+and+subtraction+of+decimals+worksheets+with+answersPDF 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_off0000d552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD552 11140 bytes
SHA-256: c3d55c40b654692238f8d07d9b5738f9f995ada51ded4c201976b6c994e90ace
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 17384 bytes
SHA-256: c7e4a1db6b3a8797dc571930512f443ca75f2c0e2d16f83c389daafc1e4c124d

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