Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3ffc86a8d36006a…

MALICIOUS

PDF

92.3 KB Created: 2021-08-10 05:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3eba96f9d54ad9c37f29e1bb03fdc34d SHA-1: 5d996b0329a89f04362c5e1ee26654f14577534e SHA-256: e3ffc86a8d36006a82ec6ad46194e537b4e7b56b22b77bf006a312c6be39ee30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The file contains numerous links hosted on compromised websites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points to an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a545296c327---ludemepu.pdf In PDF document text
    • https://bandai-k.com/userfiles/file/fodivisedege.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c98c5ff9b---kotagomipuduvokabiwuwuxem.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68837923151.pdfIn PDF document text
    • http://orsolyajuhasz.com/ckfinder/userfiles/files/wuzojagizofu.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c51b9eb3e---16256454491.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b64870a4b3c---61113629303.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/93282683273.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/52957305195.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/16588465119.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/6nmmpvopbnks3o0coi81qlrlrb/44485585978.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/87224702450.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089209f676c0---fepipadolivorewu.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9926dd4618---33363371029.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/fidas.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/69794936597.pdfIn PDF document text
    • http://ohmytour.kr/FileData/ckfinder/files/20210720_7140AC4649135998.pdfIn PDF document text
    • http://windmill-bv.com/userfiles/files/jesiropifemifukuwu.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941dea106f1---31643767147.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/60564017759.pdfIn PDF document text
    • http://runningrhinelanderrabbitry.com/clients/875187/File/60639872269.pdfIn PDF document text
    • https://cristalparkhotel.com/ckfinder/userfiles/files/31833266758.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986a6c6709a---57119231389.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160776d7e3536d---wisubixijo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7ac3905a9a1e3bfe080be9e97800c810/14209297684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=nigerian+passport+application+form+pdf+downloadPDF 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_off000103db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DB 17524 bytes
SHA-256: 389c8ab79e9a3502e34481eb0c46d529c3e986e97f6cfbe61eba0b6774ae80c3
font_01_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 11024 bytes
SHA-256: 83679d480b89e5ccc2e62be3ac17c6ddc469e54f82b9d1eec6c501335b8bcfd2
font_02_sfnt_off00014b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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