Malicious PDF — malware analysis report

Static analysis result for SHA-256 b401e66c4e79b5f4…

MALICIOUS

PDF

95.9 KB Created: 2021-08-15 15:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b9eaf743d6cb072183f4d5b20240ed1 SHA-1: f33d233a4442bf77ec53f1224e8330f0414a9ff3 SHA-256: b401e66c4e79b5f43a6b2afef84b076989e5c091497562a4d3ac18522898618d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=how+to+setup+my+dlink+router+as+a+repeater PDF link annotation
    • http://greenplanetnepal.com/userfiles/file/wuwazeduvefozogog.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/kh2equ2p2k9adfpjfo6fcvoerm/wuvelipetivopisedejuw.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/zaponedidufezudapasoxap.pdfIn PDF document text
    • https://digireg.com/upload/72021391409.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114593364774---lagufalepisaridu.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/raninaputuwedukilopug.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/990299d25db68dc90d5fa79181602095/72864828524.pdfIn PDF document text
    • http://cuatudongsaigon.vn/uploads/files/jofipadakutepiwinetelafa.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160a40a6d172f6---xuwanusuxut.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077fe46dbbf7---60100153633.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/91557293168.pdfIn PDF document text
    • https://patidarpalanpur.com/web/k/main_admin/ckfinder/userfiles/files/kerokikudunovokete.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/xozirizuferuxikebufidub.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9384247156fbc966b3bc28e8f5768629/fibojukuxigiwidozabigul.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160de8d18485d5---garuzuzapemig.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/fezur.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/45ae754fa44a2cffeafeaf57351ef3a7/mojinezesibebuloju.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/aa42d441a3dd84e28ef3f903a5c1d28d/64902587722.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/342anbkol9675cdv4mkls4ks30/96567428.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ff4d1e1c---bumadawuluwudukasidimiv.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607185f4373a4---69702518665.pdfIn PDF document text
    • http://93564497.com/userfiles/5954813042.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uhr7jrn42pn29fvoio9g087non/gumonogovep.pdfIn PDF document text
    • http://ddgasul.com/userfiles/file/sedimumawajufe.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b78b330a9d1---rixof.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/juxitapafafepus.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_off000113bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113BD 17368 bytes
SHA-256: cb3de7a711bd3234745d8df9581dbe74d39e4bd01ef6df0f51765baee1dabb88
font_01_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15803 10936 bytes
SHA-256: 40ac237758641750405c82a8920604b41a2c53f5e1d78b446a85d3f944ff275c

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