Malicious PDF — malware analysis report

Static analysis result for SHA-256 2365e2019b0e671f…

MALICIOUS

PDF

82.6 KB Created: 2021-10-13 22:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: baabaa553f9ebb240550b277cab273db SHA-1: 61b76ee97c5f3ef4ef1450c0ee81697d768fbcf3 SHA-256: 2365e2019b0e671f232b62ac503ca36df3bfa8f5cda28eedb7a1553efe9089f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://www.naraihillgolf.com/admin/userfiles/file/sukokedubojavamapazumi.pdf In PDF document text
    • http://gongin.humenia.com/upload/userfiles/2021/09/files/210908185827.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158ab566ae29---votex.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/76650274639.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/pekamevunikeziputejalijop.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/58882846020.pdfIn PDF document text
    • https://harom.ro/files/file/55003189264.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tiroluboneselini.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/jihihvvdhko4u1ahkcahdiroi1/3820125306.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615f7295de21b---20238129508.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/beberodumewawodinime.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/15115144548.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/98949820796.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sapoguwonu.pdfIn PDF document text
    • https://kop-trans.pl/uploads/userfiles/files/5456727346.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359f6305f9a---nibabejizel.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/28787635430.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/11316141278.pdfIn PDF document text
    • http://jun-travel.com/userfiles/file/fetaserejugomem.pdfIn PDF document text
    • http://chromavials.com/d/files/80854296525.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/19175824185.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161672550c8cac---fitomivotapire.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/gazutogavabek.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///40967000306.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/detipizurogoropopek.pdfIn PDF document text
    • http://uchid.com/uploads/file/sarowujepiponoronufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/Z3ufxtS7Wvw/uplcv?utm_term=solutions+are+homogeneous+mixturesPDF 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_off0000d9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF213 10832 bytes
SHA-256: 67a243cc0f55136a01a1d32402893456af66a2c7f562e50d2c5ec862e2f484d8
font_02_sfnt_off00010ae1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE1 19116 bytes
SHA-256: c5978709b49dc85528106a44662afcac06b334b4123712b0183c419f9f1b5964

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