Malicious PDF — malware analysis report

Static analysis result for SHA-256 84dbebf9911bdc32…

MALICIOUS

PDF

80.9 KB Created: 2021-09-19 09:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65c61eaf3ac2593b40ebb7f56871b8fd SHA-1: d4ea80d07e91416ed23e3bc0791fada583c4f448 SHA-256: 84dbebf9911bdc3227b04ae17608f32c5b66a43fd6a1bb8e86776b62f713594c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kammerchor-lindau.com/file/dolikekoz.pdf In PDF document text
    • https://sausalito.com/wysiwygfiles/file/25835660042.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/zosevivow.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/jadav.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131dc74d752a---lezutoxugesu.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/lekasasikaverutabuwe.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/68027104994.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/luzadiferaniv.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/9a1ukiktlv3tl0g8r9o3sdkuc2/jegikegeritupujusi.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/96161776664.pdfIn PDF document text
    • http://burragebrothers.net/demo/jolie/beta/userfiles/files/69240544352.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/nujaliluf.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/cf57b4190eb15e93fd263de13c7328ce/xonolofim.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/86478361387.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/67807033179.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f82c06878e---94164797969.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/4425848358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=watch+black+panther+online+free+hdPDF 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_off0000d91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91B 17380 bytes
SHA-256: 37157f607b861bc13759d939d2519ab0031ee31eea3c6feb614de4c176c6d2aa
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 10776 bytes
SHA-256: 70c5c92a169096b46517964ac17bc95a31e69ef325f0636cf1b1f0dd6613f09f
font_02_sfnt_off00011eaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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