Malicious PDF — malware analysis report

Static analysis result for SHA-256 10d1f59d11b16c13…

MALICIOUS

PDF

80.2 KB Created: 2021-09-20 03:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20d0fa3ea623d4c86993cc5ecf08a65c SHA-1: e2a9de50ff1b27acfe582a92d4e75b4d5a12fdd8 SHA-256: 10d1f59d11b16c130aefb087d95ed68bb8a63d5fe4127303fb2eda32bcac1720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+add+events+to+custom+calendar+in+android PDF link annotation
    • https://ancoraeducacion.com/images/mefodoju.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/13525970773.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/kofatumapeko.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914174315.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161403b62513e7---robatuzu.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/rvsd7h5ppg7b294m5sn1337tn6/deboxe.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377034a6d70---36747549305.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/fidisimum.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/kolizabexasivov.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce50bd1a4d---jazofaxipesem.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/sovalebedepifetulod.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/2713da6f37af38e236008aa932676af8/fozowagubuvigibarube.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/57328645800.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/c0622b96bb9e8de107ec61e074f21638/72013148467.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/29959153444.pdfIn PDF document text
    • http://secoinblock.com/upload/files/bupopowadelavi.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/95214376948.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16144083594707---tuvovutikib.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/87750900276.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/fofazebonazuxe.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ac239d716---wokirije.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/nadapewovu.pdfIn PDF document text
    • http://greenflameenergy.com/userfiles/file/51870643956.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_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 17636 bytes
SHA-256: 607cc75efff95bd56e62f460643bd5055bf1f5a5fdaceab7486ab28a28b2be23
font_01_sfnt_off00010262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10262 10776 bytes
SHA-256: 7a8e5b03a1e2e2130d4a11e27b8d3cb5bbec8e35fb4ca2e3745ac17f1cc0f699
font_02_sfnt_off00011b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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