Malicious PDF — malware analysis report

Static analysis result for SHA-256 6da0be9797298124…

MALICIOUS

PDF

85.6 KB Created: 2021-08-11 21:52:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3ba869925619d5e3fe83fae5da0b9399 SHA-1: e8acc5b36d8c6f81c295e65cd7ba4abd487967b6 SHA-256: 6da0be97972981243b32d3d11239c11b0873433ae0a90157b62a7fa2a93ebb03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and a significant number of external URLs, many of which are hosted on compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crewmak.ru/uplcv?utm_term=problemas+resta+de+fracciones+con+igual+denominador PDF link annotation
    • https://cairparavel.ro/app/webroot/files/userfiles/files/8914286362.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/jupifesenufewu.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/kigekunutofenexuza.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d45305672d---97032215080.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b6594245728b6c80fbdbd4d3f5ede585/betikegirizikunazivuvolus.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/71743730633.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844bacbc4fd---pulegodifodebomigukit.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/12392102758.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/5335218018.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/kolewupoxowopudigegewimaf.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/51d35565d8bf5f6898f351abb8bf8e3c/suxokelidokudupuvem.pdfIn PDF document text
    • https://soechi.net/userfiles/file/74744947516.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089be1d54783---fexosubejejoxofufujune.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/miavfre977km30hprmr14g34m1/wuzorunu.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/s5be1749tbkdhsq62udtf5gsi7/5487380494.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/73880758234.pdfIn PDF document text
    • https://nasikampung.info/contents//files/loxexa.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/4720310148.pdfIn PDF document text
    • https://activepymes.com/pub/file/wubimekidasenevufodi.pdfIn PDF document text
    • http://ksmt.edu.np/assets/ckfinder/userfiles/files/bulasakufaberalomudepugo.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b27e8667c---36124628026.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 11060 bytes
SHA-256: c77189582812e9a1e1b5305d415f4621f829006e10519e4782547bbfb61220a7
font_02_sfnt_off00011900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11900 18564 bytes
SHA-256: c6c919114984c1f673edeb265354a39198fc2c08547a04aca7b5086f58b37821

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