Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3200bebce015e10…

MALICIOUS

PDF

82.1 KB Created: 2021-09-05 08:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fea7f5fb816cfd8da8a77aeba214ab2a SHA-1: 6805b9dd8eec9d19c30a833a5188e0d25c245fc4 SHA-256: b3200bebce015e109196bc156b094d997e2311476a2ea541c0dd4954fcabaf85
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. This suggests the primary goal is to facilitate phishing or distribute further malware by leveraging these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/42389938635.pdf In PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160986e61055c9---3936147924.pdfIn PDF document text
    • http://fairview68.org/clients/c/ca/ca24e3df3ff7fa9b839de6c08aba9959/File/gozido.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/vubofanofututuxilorep.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/6jf4q9b872bll0893l444vt2t4/72283966114.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/mavowufot.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082d9f4186fe---sixafemujowizadozigazukog.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16098d35cde250---58306342742.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/topapetadubenatutikabimel.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/90756683895.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/10729349694.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16081d97b9beae---wosaximemowugi.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/90305511876.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/12526115689.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09ec1b808---surupemofekigazevaw.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/padupuwurakezetunasajiter.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/2c48ba8d45f385827e7f46a4462c3d24/87040450950.pdfIn PDF document text
    • https://mkontakt.pl/dat//file/jupamodab.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098541be705a---vigabejikafatulofejisof.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i18cu0hth639estbmp2h8ffbip/ligekijanev.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2106192246105741327thhsu69evjl.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/supekekizemawefizubudinaf.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/kuxafexorafatipijo.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/vn65j1p442cktupan976vs6jd0/nexajewarerozanowo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=yamaha+2404+mixer+manualPDF 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_off0000dc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC22 10492 bytes
SHA-256: b97be9b338f374347c0335fef14894d47d68f3d5829f75713d6d4f69359cdccf
font_01_sfnt_off0000f3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3CB 17944 bytes
SHA-256: d6d27c832d774c9fa9feb2d180bb9270b6866b4972d3c2f7fb5fc08e96091c56
font_02_sfnt_off00012290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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