Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3db4bee014e9aa2…

MALICIOUS

PDF

89.6 KB Created: 2021-06-26 16:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3049c59c8aa9a6ca3fb0dca90d14be6f SHA-1: bdf074c0ee08f732dd06f3ff668cbe7fb0edc31e SHA-256: f3db4bee014e9aa2d09ae57b9a12776b86b3ac18c2f42be8b40e404c73f598fa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress installations, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://wastran.ru/uplcv?utm_term=zootopia+fanfiction+nick+and+judy PDF link annotation
    • http://weifong.tw/fckimages/file/resazomikufaneza.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d00c4ebe303---70937445887.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bcf606a0---53788520417.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f6f87aa27---dabipubinuxopomatuwiweteg.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mq7afh2ha1nn0g3ao7eol2kp8/77365338697.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210522070755_hrwyen.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/mogikilajazifogaguboki.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ridumikodovukawufel.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/guwajos.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/e53015dbd2c25182b50944f0dda331e7/muwasakifolunatakegejivu.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/jixelizuvatalamufulonezel.pdfIn PDF document text
    • https://ka-base.no/images_content/file/wodiruzo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac6bc1cf0b0---tavemu.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/d94a8a573573dcd5fcdcf33fbdaa1e14/vudinorak.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e8mcthg2sndr6noinsf9a46rn/zawopaximar.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29bc689e8---jowozidumawipufaku.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a75d1cc41a---tibigunavanaxezovofi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31ba24272---kekutu.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_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16776 bytes
SHA-256: d05f32bbefcc818d445cd2f2e72a489d515a5a5186a46a90cc7709cf32777318
font_02_sfnt_off00013fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA9 10568 bytes
SHA-256: 233273829e26593063e70f59709465b1afa9426453a96fc9338d8ddeba62f854