Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a49a72dc1b1d882…

MALICIOUS

PDF

80.2 KB Created: 2021-09-19 14:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a51960d56c9412a4fa2eb03002484ab9 SHA-1: a0f8ea955e7b712379c68554e1fb39f5be34661a SHA-256: 2a49a72dc1b1d8820f6b85a5cb861f7eb58aa188bdc5c42d7a911b7c65cac176
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple external domains, some hosted on potentially compromised CMS uploads, suggests an attempt to redirect the user to a malicious site. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress upload storage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://schodylux.pl/userfiles/file/1666108239.pdf In PDF document text
    • https://bilegt.mn/userfiles/files/1025461544.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/54043670485.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2c9f2ab4a---fadelogediludaxokim.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/xarakezuzoloponimi.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/22175041423.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/pumorasovubige.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/56417936632.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613db1e79ed9f---siresawese.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/gajutejada.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vre83pobri4kin36lp4pos115t/kujejo.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/96c806e0fb0ea58fac1072feface3034/lamewovelobazuxegu.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/50333187964.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/welinoweba.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/eh2e6r0sa22pusvoij9o2qem7l/takutenasakum.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/p60q5drei6opitc81h3m94v8lo/15898918358.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/84094999991.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/vutililejadenokoxoge.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/tusob.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3c44ebc81---34268025250.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/votamox.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/ladulatetudonanamerukede.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443bdc83d79---24139746631.pdfIn PDF document text
    • http://tomgiongvip.com/uploads/files/file/zukefatisek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+cardboard+video+playerPDF 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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 10544 bytes
SHA-256: ba4e263b8b2762a7bf1ff528c3ec32856f3c94adcd5e661ae8be82cda9a1fc50
font_01_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 18704 bytes
SHA-256: e74541d2aa0371f030858a634efa2ed59eaed3d1b4575600a95beae19513c9ee
font_02_sfnt_off00011b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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