Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a593cb19e639af6…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 08:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ab649a8f5eb81a0d8fd5fb6f2a149376 SHA-1: 8b227823f4adca178f2a8856a69b9ade19ff06c3 SHA-256: 5a593cb19e639af688fae58396db3ba6a6d7a021f7e155fd1afa186e1b85efab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134004c5bf37---judapumavafovigivitola.pdf In PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/15211112993.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/petosotiwanazo.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/57488124358.pdfIn PDF document text
    • http://alptw.com/images/files/82413685685.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/gekosepijuxuziralupikurax.pdfIn PDF document text
    • http://linza-market.ru/upload/files/bamalarixijereronalenava.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/54495527611.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613711b58ca71---xiwozajudasagoladaledir.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zutofefebaka.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/kodaxovibog.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/tozeb.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e3de20268---20272483453.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109090945457647.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/otrkhm4pevkl52u5dm6uc2hor2/97800828710.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/10322374847.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f7479a4bc---99458592297.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fezusuratudegov.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/o248gkdbn638glpsaiku6isth3/49933441699.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/50502583270.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3d899919a4ee616e4ecb9636a4f45418/22645100593.pdfIn PDF document text
    • http://emeat.ru/var/files/34061223706.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/80141754315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=asphalt+adrenaline+apkPDF 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_off0000dcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBE 17016 bytes
SHA-256: e4d488d16f566552c7332841da1625a9f2f711170ed193c1fe938452ab15ad95
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 10440 bytes
SHA-256: f66e629638cd34aaed8914999bcf6214c0981ffeae9d50912c1757c36b891dd2
font_02_sfnt_off00012012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12012 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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