Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbda52c9010f343b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-08 00:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dc760d5c88d74a1e78a855cef2325bed SHA-1: 9cfe82e607f99bcef7c2d43267c495454e008453 SHA-256: dbda52c9010f343b08880304c4735dd90b9f122fced4e7f4ce2dceaf4ca23dcf
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains a link farm pointing to compromised CMS upload storage and instructs the user to disable security software, indicating a high likelihood of malicious intent. The embedded URLs suggest it may be part of a phishing campaign or a downloader for further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yellowmangocafe.com/userfiles/file/zaresejosunepojobuso.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/finukefatuteloluvubiv.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/gejuko.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/damaruzetogixepurofoji.pdfIn PDF document text
    • http://oodow.cn/upload/file/2108092247288784308tmcdj724209.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b0c71c612---50008043379.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/34362875235.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/80945289884.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087d92bf15dd---kativa.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab8e74505e---16136627201.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/70808105811.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/favepowunatekudag.pdfIn PDF document text
    • http://kfbi.ru/content/file/67359044262.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/22724829740.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07cd30cd47---15975989652.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d66a58a851---weketomume.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/37856175874.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/21910886421.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/gaduk.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/85825340630.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210908031339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=pubg+lite+garena+manual+patchPDF 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_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10772 bytes
SHA-256: c41ac47db2a3cf933ac05c9ed81a3ad56602934e250a3258675358ca9396ad14
font_02_sfnt_off000106e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E9 17920 bytes
SHA-256: a436504b21805dddd222350745005c39c7b635a4f1abe9ddfd1c55009878b455

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