Malicious PDF — malware analysis report

Static analysis result for SHA-256 34a4ecf4da07a201…

MALICIOUS

PDF

163.1 KB Created: 2021-07-28 10:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 80482b246e91f234b19a1dd54dd88c54 SHA-1: 630acca2040d0e4d388666cd064f46c4f99c4565 SHA-256: 34a4ecf4da07a201e5b54e908912f4124a784d842586dcb6c77f60ec22dc759e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains heuristics indicating it's a link farm and a lure for clipboard command execution, instructing the user to paste commands into a terminal. This suggests a social engineering attack, likely to bypass macro restrictions and trick the user into running a malicious command, which would then download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9500

Heuristics 8

  • 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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://kirilmazbardak.com/userfiles/file/kemexatusu.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///dinevup.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/99694613403.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86564d5931---rupizoruwep.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/ufj0n28sjfv3hklboqh7bculs7/mamefalage.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210605001940.pdfIn PDF document text
    • http://surrattsville69.com/clients/8/81/8122276c22396d7fa0996010cc369f50/File/notas.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/laxasirexuvuma.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/givozofikuwelixikujala.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/071d3c69b1a1d71c53b30cf8872c5ac7/70367070443.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e852350533a---nasasoramuguxilepuri.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/ruxevok.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ec18ba75d---97706348401.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/88729070476.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55e30dff30---nidigakebewed.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607829521c045---benoruwozu.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6c7d794f8---danumapopisokas.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16246039255977.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6c44f2ae8---raperaveje.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/dalerowajega.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ff9080dfbac2925d8ee303265b3fa7c8/vijitop.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb754918f5d---4406954537.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/81d15e30b87bd76a6f1e2143659205a7/tizibujeriwetomoneb.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/57738508504.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/d637p1p57bb2u0gq2oleg9rp91/67533883722.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=epson+l380+resetter+adjustment+program+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E527 16284 bytes
SHA-256: 39fe6e0f29123663ef223b98073d0564cb5652633519e0232cd65be111ecae86
font_01_sfnt_off00021812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21812 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00023024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23024 17820 bytes
SHA-256: d7de265c6fb13859653759b090d75817ab355451bc7084a86d0960a100e4875b
font_03_sfnt_off00025f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25F21 11572 bytes
SHA-256: 8c9be862ac2a335b94fd572736efb70d64f91eb8de9a9bc92209585fc75f3c98

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