Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1eb180d565d452f…

MALICIOUS

PDF

76.9 KB Created: 2021-09-15 20:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0928e2dc5877e21cec8eed7b4ba71c63 SHA-1: 59328dc0bf0d2e7f63765b00d9c6bdda90b9c310 SHA-256: c1eb180d565d452f7c3e6c24f6622785b04af89ecaf4a47a62255dbda87f21de
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to lure victims through a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://highspiritsmusic.com/ckfinder/userfiles/files/80917150830.pdf In PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/77l99fkocju572io2kt40oh84u/36226540905.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/femijawedajuparevakok.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/13201437462.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/rililirabekulanuv.pdfIn PDF document text
    • http://yanartextil.com/firma/files/razopijefovu.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/fe5j030c6tegsutpla036du4ma/tozugeki.pdfIn PDF document text
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/68963288095.pdfIn PDF document text
    • http://vetportonaccio.it/userfiles/files/texosomini.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/sudejamije.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131e2da46a5d---23941249822.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/todunavotudererapolubo.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/21703330288.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f076363c35---45545536334.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xujomumuroranaxipazuwow.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/15824175622.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219394964321.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137971ec4fff---nizavegipewid.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/dozubi.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/qgoj51uglv9jl7fo1i0d3uhcq1/nokasamikuzivoze.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/dosetefeviv.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/60469678900.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=wrong+turn+2+dual+audio+downloadPDF 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_off0000c947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 10420 bytes
SHA-256: cf172287f2ffb921e23e610c19d0a2aa30d667c65bdd49074800a7b08c1de976
font_01_sfnt_off0000e0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DE 17400 bytes
SHA-256: 94dcc86636f2126581aa339f43633c0e0986f1471eb592d48496a8846c668082
font_02_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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