Malicious PDF — malware analysis report

Static analysis result for SHA-256 382acc342686f500…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 17:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 271b1e78b8e0611b0881a3ded095333c SHA-1: 730cf6e9f07c7a4ea45fe44ac027b1de939fff7b SHA-256: 382acc342686f5007037007cd0ad2bea882d71e7cab83bc23a9fb70acdce1025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of numerous unknown URLs suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/28vc9fuiimfvs0dptuhfkckpf7/bopisupikudixitomirumeduk.pdf In PDF document text
    • http://poorclarescork.ie/images/zokigarumulumifutem.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/bugekirumimu.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/80793180094.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/24690055708.pdfIn PDF document text
    • http://nprofit.hk/userfiles/61736370534.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfdd87a575---misavokuxujufujovilorisud.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/21693280448.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161369d90be8af---20861773568.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/30225090718.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/35600862264.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/mezipifuwewemo.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/pajom.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/zovakobinedilok.pdfIn PDF document text
    • https://breedlife.com/upload/files/94373960750.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613adcbe4df48---45437376958.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/vegeturawimane.pdfIn PDF document text
    • http://abwmarlboropike.com/uploads/files/jirogufipulokamokagowejow.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/livewafefo.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/97934771325.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/xofudederijijowu.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/fisurodofolorejuz.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109130621563188.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/79640929903.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/sozafex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ip+tracker+apkPDF 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 18008 bytes
SHA-256: e8ec3dc5271d2e9612cef75ecc1b43636a174d47847d2bf1001a9a44fcb9cc74
font_01_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 9880 bytes
SHA-256: ca0d07198f9eb2a869d1de57da2f2408af262b4def6e84f3fce56d3d4258f6d9
font_02_sfnt_off00012257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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