Malicious PDF — malware analysis report

Static analysis result for SHA-256 9edb5b0ef836fb0f…

MALICIOUS

PDF

84.9 KB Created: 2021-06-26 04:32:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e0d5628628169efe648f9dae878ae1f SHA-1: ffb545de23312659043582a4ba6ce52ca84d4779 SHA-256: 9edb5b0ef836fb0fc75bf78fea4e957625224163054361329bdedc852308793a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://krisoc.ru/uplcv?utm_term=dynamic+business+law+the+essentials+pdf PDF link annotation
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/a7a7rr758vnivfc2g7i65u03qq/83337221914.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/qshuk5mv033hngshpp835uk1ec/gitorer.pdfIn PDF document text
    • http://photo-preiss.com/upload_files/files/30438233257.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4dcc3bad2---nifajotan.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/tezoraf.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/106361855160ad9fa74c868.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/6404bolv7tqt4rq2lup9p703cg/8776617845.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97c0a4df95---10280838484.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1608f785e86716---40909103865.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/kadezawafifujadevizoti.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bulusidobon.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/68830809032.pdfIn PDF document text
    • http://servmed.net/userfiles/file/76663767843.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607357b51ccea---94037710824.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/dedf3b7g2acne6l4vhi2lve033/80498340352.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/kudanovonutozupexom.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/wabedageworoferazazin.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073382c7ee07---27895022618.pdfIn PDF document text
    • http://goref.ru/files/file/31405577608.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/77418046879.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/g45fkqjf8bh3ilf8m0kjmarnul/90744968726.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d79d870ac---vixegurudetewaj.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/baacfa376fe6d9a23e00ac60ce5adbbf/nerikokowesosivena.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1e614ef7d---2823986113.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/76997132512.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD128 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE939 16084 bytes
SHA-256: a79c9caf7d9fe7d7e6557dd08284a48a0650ee9668136fadcfdab94fba17ddb2
font_02_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 18012 bytes
SHA-256: b560c91f35ad1fbd7f02e2a8cc7298537cfe35ca085a884d7b7c108e2df490b8
font_03_sfnt_off00012bce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCE 11108 bytes
SHA-256: b1866c57a61443120d58a17a0898ba2e1f2314ff21315487faafd7912d8cbc87

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