Malicious PDF — malware analysis report

Static analysis result for SHA-256 668f74bcde2143ba…

MALICIOUS

PDF

69.3 KB Created: 2021-09-18 02:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f368e06a44576d1f5fafdf5ceca38ea SHA-1: 9c998aa9cc87e8d0ef7f0b0c4f73ecc10ca07b27 SHA-256: 668f74bcde2143ba5f5649fc89c2bb62db10ef33b6ce44a7dae29bea51f11bfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to various domains, including compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination or evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=123movies+app+download+for+pc PDF link annotation
    • https://starfoil-mail.nl/uploads/wysiwyg/koxar.pdfIn PDF document text
    • http://autoservizimensi.it/images/fck/file/pudujo.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/lulasaxutetoriserujuxod.pdfIn PDF document text
    • http://www.bandungmesin.com/file/buwoso.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/38506877827.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c8504056c---20688470116.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/ligenefulamumefup.pdfIn PDF document text
    • https://shidoremicrosys.com/media/wupepevepeveve.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/49032954314.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/getekukof.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/57790880927.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c261bd15f---72112659764.pdfIn PDF document text
    • http://safiorida.nl/operatori/userfiles/file/34131303642.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/jafunimidibogad.pdfIn PDF document text
    • http://sayarbobinaj.com/file/13070428738.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0a5f95fb9---90525015159.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/nudubilozijoserigelom.pdfIn PDF document text
    • http://baocaosudanang24h.com/uploads/image/files/guwigonidosigajof.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/41113876275.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/virakakulaledumubedojaj.pdfIn PDF document text
    • http://cec-intl.ru/app/webroot/files/file/labubevipikudefukuropapo.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613be98f2e648---fifuguruganoso.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/41784867371.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/muxex.pdfIn PDF document text
    • 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_off0000b1db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1DB 11084 bytes
SHA-256: 06d9defa9cb158cb32033fa6b0c7503c506f0ef4fed69fa0657867cae5f38748
font_01_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 14268 bytes
SHA-256: 42c0077e96c480ffe1e086362db8da260ce8451f9758d8e45cb12f6141140ff4
font_02_sfnt_off0000ef76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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