Malicious PDF — malware analysis report

Static analysis result for SHA-256 1403f63d77cedeb5…

MALICIOUS

PDF

83.7 KB Created: 2021-09-01 19:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e471caae374a91ad4c5a81bf56dffe77 SHA-1: e2e580b87459011b069ad67a45871f495a62028b SHA-256: 1403f63d77cedeb55e4dc04043ed4a2494053f1824ad40f554cf2da0a97774e4
96 Risk Score

Malware Insights

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

The ML classifier strongly flagged this PDF as malicious. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1612936391dd72---78399506840.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607257eb5f64a---17402748657.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/lojatat.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/64371825752.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836686bfe9d---xikosuguviwavafidenufapip.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/640b7d07a6bce985cb211c3b0de13ae4/petil.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e85d5e05d3e---piwev.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/29611028955.pdfIn PDF document text
    • https://melz-feu.ru/upload/wifezaferibupoxiwatitulu.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/41546eca2aeee8663cc2e36115e5b01e/86666705508.pdfIn PDF document text
    • http://schokobrunnen.com/idata/zajuxun.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0190ef5c003bcc8a10c23343d34aef71/zumexanukuzukofatuxug.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d0a97f0f5---17460510154.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c733b945af---bazozutoxu.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/81705004091.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/jalakokisoxexolef.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/22644801825.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/28478061364.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/65280612936.pdfIn PDF document text
    • https://tattica.byespresso.com/app/webroot/files/upload/files/sadumutixeveru.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/32010450953.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/fudub.pdfIn PDF document text
    • http://newcastlehigh1967-50threunion.com/clients/43248/File/59310327287.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/044fa22ab13af5c3d0d4baf05d08afe0/31130746988.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/zufaribaberaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=paradesi+tamil+movie+download+in+utorrentPDF 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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 17904 bytes
SHA-256: 99bd20c5e97976cdcdce9a8f3d6b6dfeb39b290cb8cd5c810ee78da749bef5b7
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 10660 bytes
SHA-256: b4ffaf3e682826a69c1538f21fdadbfd1e4748709b97ea8f2d416dbec4a33bc8