Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8bdc0a3b4d1efe…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 06:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6451a23e17828f43875a5aa0491083f7 SHA-1: f96d73b6a7bf1364a23bdbf5621af5f57075aa90 SHA-256: cf8bdc0a3b4d1efe8f624e01d0f48250591152b18f8a91c65543a3abfc12ae04
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://pitin-akutsu.com/js/upload/files/5959349042.pdf In PDF document text
    • http://twxcd.com/img-aim/files/80339622516.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/rurarisaxodu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ca23734534ae16ecbd9b276f7588027e/vobijopupubasiz.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/67362637166.pdfIn PDF document text
    • http://metallpress.info/files/18744411248.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/75885492777.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cac7c30f314---sanijesoju.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a5aac85433598f81ec363aa26c23d21f/10661056401.pdfIn PDF document text
    • http://ranagro.com/files/gazosumavetutiwugato.pdfIn PDF document text
    • http://fkhd.cz/data/img/simasumubi.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/29130597259.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/913304abc3ddebd6c84a9d94bd94ad07/fuvedi.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a2d1abc2f6---54867582987.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/15bc67a6279014241d8414b72bed89a5/pamem.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/55840944595.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625471849.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/52655499944.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/52573256336.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109e4e4df723---fizodofuxifokewik.pdfIn PDF document text
    • http://kfbi.ru/content/file/gesujojuvaram.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac0d45879---sigifujalavemigonuworaxi.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6737d5990---lelukizonisuvegobugof.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/muxidajaxajufati.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+remove+watermark+from+pdf+foxit+readerPDF 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_off0000d5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A4 10676 bytes
SHA-256: 5a98c240cecdf03fd17e51308790ac34769d623974375937c3520b55181ea747
font_01_sfnt_off0000ee28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE28 19260 bytes
SHA-256: 675c27b4447129769e61ddb39596484a762572b8333d819816203185ab8bb854
font_02_sfnt_off000120ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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