Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ce05229a3739fa2…

MALICIOUS

PDF

84.0 KB Created: 2021-09-18 00:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c5e2c6bed59d545c09db69d3dcae78c SHA-1: 4dea5bf6870529832094d6301238e9264fedc1cc SHA-256: 5ce05229a3739fa29f107740841d5cefa745c91c23274e9489074648f3904898
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs the user to copy and paste content into a command-line context, a common technique to bypass security controls and execute further malicious code. The numerous external URLs suggest a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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=windows+7+ultimate+operating+system PDF link annotation
    • http://www.vljainandco.com/userfiles/files/kenusebekobogatufetifedi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/8cbf80ead6c652d3fa31b94dc5c82f5d/90091189724.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/21963249722.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/b08ff9985abc84ec76e7881ea880b4c2/dowimususugu.pdfIn PDF document text
    • http://nato-denkmal.de/uploads/file/texazaretirati.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e492f36b02---5635592530.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/xuvojifu.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/vuzabadudowafutitofufaxop.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/rapudukexadeki.pdfIn PDF document text
    • https://atiksigorta.com/files/juxidorasedekoxorinag.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/renuminukoruzil.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/pafazob.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/fugigekolutoxejejoso.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/75985544477.pdfIn PDF document text
    • http://unibox.lv/files/text/dujirogezamek.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/1da1k5sfbv4gad5psh04rv4jh3/25156031207.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/rikevozeliwefawapu.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/43684716537.pdfIn PDF document text
    • https://olivermilk.com/tctt/sites/aaa/file/10322374847.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d7f87645d---22065169696.pdfIn PDF document text
    • http://homeopathyhk.com/files/fosubotigofiloguw.pdfIn PDF document text
    • http://riph.pl/userfiles/file/30625582987.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/93030590073.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/1985672972.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161412010367fc---26814831673.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/65305278092.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 18096 bytes
SHA-256: f86db2409f1dcca0f748bf5e7a74f3cdfc0662ed3b16d02164e62c01f31654d6
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 11080 bytes
SHA-256: e3ccce0b4da50bdb6fae1f4ad6b7e9afb0a9fe08797868c06d78ec2998ef2899

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