Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b00f61d9a410bfd…

MALICIOUS

PDF

82.2 KB Created: 2021-07-30 06:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 299d8ab51d80b52b135039b51d9aa3c7 SHA-1: 7335c77281361b8d1c2aae52ae5cab17807673b7 SHA-256: 7b00f61d9a410bfd6c313248e75ce693ce9300e20059940755057504dd64b799
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external PDF files hosted on various websites, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious content.

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://ahkjt.com/upfile/file/49222661.pdf In PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac79d0bf50b---nuwinijixip.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/ridusedinaxaruletesud.pdfIn PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/15844984045.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607db825dcae8---zalunatujasojegatoxokuj.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/ea6fe76a0ae49820769598872e72ab5b/tawedomidepovine.pdfIn PDF document text
    • http://mvhs78.com/clients/68382/File/76548441653.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210722_110003.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/xozuziwid.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/gozakotoxugamo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b204df7dc12---denakivijasijaramodejuma.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/52616016390.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16071f39070775---laboji.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/28872429644.pdfIn PDF document text
    • http://modern-pro.ru/files/file/rojaxetamuxixigewetezas.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc82447002---31187345529.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607e5de721144---42277207145.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/vawuvepadevawedetajuvexa.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/semaboza.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6d15d22eafafcdb8f113fcfa42b35ef7/returofuwibilirizavid.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/igpuk4i5vtk21i1qlkgpco7fgg/40440102532.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/jixodijefam.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/tukam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=myles+munroe+understanding+the+purpose+and+power+of+prayer+pdfPDF 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_off0000dd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD62 16608 bytes
SHA-256: f2ca7e7cb934ca657ecd5027a89e778248c406a4cd9a5d65dcbe7f3b161aa60b
font_01_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 11236 bytes
SHA-256: e4fd35bd05d89d47df416f76a0dd9dc57eae0ddf65342576b5dd19642aae57d4
font_02_sfnt_off0001229b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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