Malicious PDF — malware analysis report

Static analysis result for SHA-256 6506e7dfbc1273e2…

MALICIOUS

PDF

71.6 KB Created: 2021-09-03 15:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c99b97764f8a18602aef1bd54c75810 SHA-1: f63c904515c369671ca39b879cec4c88e9fde476 SHA-256: 6506e7dfbc1273e2c0ee159eab8e66661298a3f6f2d4f42a388eb01ff94b1095
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and link farm heuristics strongly suggests a social engineering or distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=bitmap+to+pdf+converter+online PDF link annotation
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/redawot.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/19d57e517de4bd1778b8dca89d2eb48c/zurusuzuvibageruk.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/73356437604.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16106438c9d110---31260351940.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/rhilbvcjkt985aq5fdaktgql9j/nususeripavukevotiniso.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k60k94eqft8locoo3475akfr57/86029922543.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/losodamowamaxureji.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/4bebbd9d2ecf7a178377b6cb9df6c5dc/14484936598.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/08f08d3605a9bddc57ed7b3e26df889e/14998098196.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16105e78ea7a0f---92364233717.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/wubavolivaziko.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b4d4659d0---buwozekixabuno.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/3fd3ed0e440199fb0f8a36de96c6c78b/vetofivubononufovida.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/bjvqi7a6okang72sc6vj8u6m1f/gunakajabet.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/bfb9875505644e366db7377a8610bcaa/51286323364.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/96384147449.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/kelitarewexob.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/s50ophcpn8vdgq67mi4nitfsop/9753469927.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/lunuzeforefozodaxegibiwu.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/11163540576.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125d6eb9e4f7---rejawuzero.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5652223c---risite.pdfIn PDF document text
    • http://topcudental.com/img/userfiles/files/15456192845.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/73680429022.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16087423bcf394---nuwav.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_off0000ba15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 10732 bytes
SHA-256: c1d97826306e1cf7165b5d77b5edbdd6b70cbec5769705be56b1e5d367f0421e
font_02_sfnt_off0000ead3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD3 14896 bytes
SHA-256: e3dad3e0d6f53defc34ac03d4572c2af30b71d4a76ed11a6bd78fce460f1c419

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