Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a9b309f112548e…

MALICIOUS

PDF

85.2 KB Created: 2021-08-14 11:08:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 88fe80b3d75e338b8d6dd0aa0ddf99f9 SHA-1: d65eea2acd5917d7957a296b280561403257a3da SHA-256: 39a9b309f112548e6c00b23e8fc71a5dfdf6670f9028230813bf356132564ec8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external URIs, many pointing to compromised CMS uploads and disposable hosting, suggest a phishing or redirection attack. The primary goal appears to be directing users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sevimticaret.net/userfiles/file/99704495620.pdf In PDF document text
    • http://dentalclinicbangalore.com/uploads/pezuvikupozotisun.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/dvrd5a1qt7vdln9u7ts5pnpl7q/40482791659.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/fea2466625bf41eebbb4abfe676b5bee/23702689529.pdfIn PDF document text
    • http://www.llmhospital.com/www/js/ckfinder/userfiles/files/18290525202.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983ed00bf64---84180714243.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210702105849_4pnpos.pdfIn PDF document text
    • http://xn--b1agaa2anfqdp.xn--p1ai/ckfinder/userfiles/files/40068758481.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/busademebixanufazakeve.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/50239277041.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098592a13722---mojobixuxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6392ae3a7a---92126866024.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/juzopugilapukuginuru.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lijapiz.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609258deb0d12---nuziwagiputezonuz.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/16645163472.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/8894598233.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/87408707191.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/4b0b0c429f5c2c2da2e6b39150227127/77177756164.pdfIn PDF document text
    • http://reklamaopole.pl/userfiles/file/29573413681.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/cc8bec7k4rfc9jvueok6f3ijr7/29754425013.pdfIn PDF document text
    • http://creationart.hu/files/file/nalososutategeg.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c184262d8---90103171690.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/a703eed0d8b5dc77e074acdc23649721/bafuril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sonu%C3%A7+yay%C4%B1nlar%C4%B1+9+s%C4%B1n%C4%B1f+matematik+pdf+2020+ebob+ekokPDF 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_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E6 11832 bytes
SHA-256: d142dc3dab1f22227f01363cf7715374231fc80913c291d363668607bfc6ae4c
font_02_sfnt_off000114fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FC 19240 bytes
SHA-256: 35881360e6fd1f95ecc4a85de3a65abd9a5972ef80308f09027104d7c9ea5a49

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