Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e5007822a6c3b5…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 21:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf8deb812ad885a4270da3a4b9494e2c SHA-1: 1bd8c025c4cf4e35418ac5933a2b282536b9c721 SHA-256: 86e5007822a6c3b5e246d0ea4d3031ebc60ff4becd3fd529466d26fb8a638d99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/bv7hd3sd8hkj1hc2tjrs0qlbr6/35876209626.pdf In PDF document text
    • http://driver-jazda.pl/upload/file/limaf.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/56737382945.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/1802182925.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/54244461984.pdfIn PDF document text
    • http://kbchina.de/upload/xomesirunawijimojojabi.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/vijivivudoxabugum.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613558c1d5afb---2711706350.pdfIn PDF document text
    • http://hnspkjx.com/d/files/jukepajawopasasin.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/119184629.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bcfb3fe31---nirupesudowilusafuka.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/lovisafozemar.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608937a8ce168---wogub.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/3689628084.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/d6ca7cc9562fc17259fc0a49e6d2a51d/83595964663.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dabba2cadf---noxajelowurekubelunajo.pdfIn PDF document text
    • http://charivne.info/images/file/figozosoguziviregawidaned.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/fenerodonuwodagu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59901600878.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/zotofudekifewiwexabuxowes.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/30559517396.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d46c9e28705---51992530340.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/mikufazisudurosojawuz.pdfIn PDF document text
    • http://aweibel.com/Photo/file/lubotovagixunibepiwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=peugeot+2008+allure+2018+manualPDF 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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 10792 bytes
SHA-256: 5cf41939f65d13b628de944cb5ffe05c66af31bfc022bbe954e08b22fda581cd
font_01_sfnt_off0000f43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF43B 18464 bytes
SHA-256: 06c22e5495fb2ffeb64cb4899dd8da128f559c7415b3902d2f2eeb9f96f68b81
font_02_sfnt_off000124da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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