Malicious PDF — malware analysis report

Static analysis result for SHA-256 1701108e75f72571…

MALICIOUS

PDF

76.2 KB Created: 2021-09-26 21:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f3a639e51849103113cb111e12f92db9 SHA-1: ed775618076bdd7183216cf7775a42c26643479a SHA-256: 1701108e75f72571783dd8d05c7d4b0114328c887586b205bd009fc203c3e5f1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=conversion+de+unidades+de+volumen+ejercicios+resueltos+pdf PDF link annotation
    • https://weekendtripskolkata.com/userfiles/file/82981465267.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8b12a7299---jerodugeri.pdfIn PDF document text
    • http://tcihk.com/userfiles/550451945.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/vaxakozivunadizoliwi.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/93900190705.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///vunakizofuwibaxejudu.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/21964872021.pdfIn PDF document text
    • http://biomehl.com/images/content/files/relilariwixenurififemon.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/rexas.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/bebukorubelidas.pdfIn PDF document text
    • https://viettrungson.com/media/Files/69268158310.pdfIn PDF document text
    • https://askflip.com/uploads/files/wexevaxisezuwokawis.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ace2e40c8cced016ea2ad24ca67df76f/27864777601.pdfIn PDF document text
    • https://greengenome.in/admin/userfiles/file/gaxavunidukomiribilet.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/sutezigu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87b346ee8---18471200425.pdfIn PDF document text
    • https://al-wesam.com/userfiles/files/91193124784.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/tebevap.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/nuxukegowovurezakagu.pdfIn PDF document text
    • http://vonschickenfremont.com/uploads/files/48716316318.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/letebovibesuzodede.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/sugijuxerokalukadebeg.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_off0000bf08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71A 19368 bytes
SHA-256: 2bf73b63800c3ecc8a62a347930ccee5f086c65e18c836dab561a259f839d82a
font_02_sfnt_off000108b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B0 11108 bytes
SHA-256: 19d33e8ede4b81207408b9e04560ddc85941bb1defe92aa235eaacb51f1c7e61

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