Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b31f9f7976c668…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 17:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3ca46b337eab7753396ca8b2e9bd1913 SHA-1: 11d1024a27dadc6bcce8227ae869d00fddf911d8 SHA-256: e0b31f9f7976c6682fa45fa1fd7a22e2742648f93c4c1e2f43f1bcc8a89c0776
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple external PDF files hosted on compromised or disposable domains. The presence of numerous links to potentially malicious content suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kanstm.com/ckupload/files/peduzitoza.pdf In PDF document text
    • https://cicadit.ro/UserFiles/file/nuboxina.pdfIn PDF document text
    • http://phuongdonggolf.vn/app/webroot/uploads/files/sujegudazirajafunekiwo.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/6cbbb94b90ceee463e2e1d4aecf5eace/42587577803.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26bfad504---mipoxorufukivaw.pdfIn PDF document text
    • http://atrsara.ir/resource/files/17439626279.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb126755e1---28077851199.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090141983f97---31701659462.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021072419261262901.pdfIn PDF document text
    • https://mcsfood.com/images/file/logenaniwoxejavewutivo.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/6046b79574f430f192fc02692fb9afdb/61439121926.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160907b67b2ad2---65942278849.pdfIn PDF document text
    • http://bienbao.org/uploads/files/lepimalopolij.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/suxusamoj.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210730114906403059904.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/kulifotukemudezosetofekog.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/pazenevurokos.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f93426ba418d92e37f52be29d1f0071b/jesanifoxitirawu.pdfIn PDF document text
    • http://eraucheta.ru/uploads/file/lasadufu.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/65628432216.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e17825d565---mizamutukasazuvixinu.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e30d5fc74b5---51319851510.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/20718941900.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/67326399454.pdfIn PDF document text
    • http://ddms.tw/upload/ckfinder_temp/files/20210704165138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=career+assessment+quiz+pdfPDF 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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA7 18424 bytes
SHA-256: 2bd45cbf8c41a1f609b7184a7eca86ae55551db34c7f760815a17087037bb27d
font_02_sfnt_off00011f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F00 10828 bytes
SHA-256: 37bb5eddad9794616516ee9dedcfc80b2421bfbb085c57d225a97c085b3a1d7a

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