Malicious PDF — malware analysis report

Static analysis result for SHA-256 98f5a1e2bd75f0ac…

MALICIOUS

PDF

81.3 KB Created: 2021-09-11 06:45:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 58587bbe4aab4fdc8a818274053608c0 SHA-1: efb5092b5f97e4f91ee9e8cb8fc700b26178e95f SHA-256: 98f5a1e2bd75f0ac83cd65a2c09cf7fc3319f2422878f66d19c4e69b02392ad3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://philabc.ru/uplcv?utm_term=getting+the+love+you+want+ebook PDF link annotation
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139bf460fad7---basatubotelin.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/kegiwasezapaguwato.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/lojabikasu.pdfIn PDF document text
    • https://aildf.in/userfiles/file/jurevulufatakukewedi.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/47141968280.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/75041506678.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/jepolapegevowavefejagi.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/73025716001.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/48765767748.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/28371837390.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/56417357111.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/woketezalisadudironoruf.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/9715242961.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/16152279345.pdfIn PDF document text
    • http://baove247.org/upload/files/zuliwerof.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7dd398b43844ef5823400de1ccc76fe1/kazepegemezoraw.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/21036227793.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613758d685d13---ludibixuzizefejik.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/44632794951.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613159297582b---penopivoxivevanorix.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/40417656008.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/jowul.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7vufc46iqgjcop3ftcdam534u6/rezevesamedos.pdfIn PDF document text
    • http://mitroc.com/userfiles/file/27038734429.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/tipoxopowes.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_off0000da1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1C 17176 bytes
SHA-256: 2ca742ad42a09841cdce71e2f27785f322b1ebe3899f9b8dc95d02343bc385df
font_01_sfnt_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 10756 bytes
SHA-256: 5ce6f3d2c9992e2fa434e52798e52dddf7b7f4a49d9aef5571e484e523be0764
font_02_sfnt_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1