Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d20af6363a7a9a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-13 21:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 81915e1bd1cd94ae592b4a4916888179 SHA-1: d93df60cf718979b824658f54837ce82a571c102 SHA-256: c0d20af6363a7a9a4e1002dbae61ef5e6c002fbb5e75cd10a54a7d3e3e336911
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious. It contains a 'clipboard command execution lure,' instructing the user to copy and paste content into a shell, which is a common technique for executing malicious code. The document also hosts numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7ff9f7b2996b56abd2e75a78c8110eac/xukejavumuji.pdf In PDF document text
    • http://sunmoon-glory.com/web/upload/files/nisaxelixodetovawita.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909040633.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/gikuruk.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/def3lj7v0j11ongaghvjdgcvng/48677274617.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/miwulovek.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6369fb24b03fa7e3faef7833c942dafd/66118329799.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/tilarazijepodexufotez.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/569180852.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8c6d43---rewobosasusanod.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-7/20210907080621112197.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109110014381722.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/ledufizo.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/nusazedojebomibasofiton.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/33f786aef10aa28c319180782375e2ab/4767832210.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/70680176016.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/jobajeguros.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/sesowevoxagugogixegax.pdfIn PDF document text
    • http://pasaru.com/upload/files/jekulebemanusi.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/92398862203.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/nuzufoxamuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=france+tv+apkPDF 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_off0000d8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F8 20044 bytes
SHA-256: b3240124d8fd026d3ba98f6bce01299011ee586afc420750832b48322586a79f
font_01_sfnt_off00010d81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12598 10076 bytes
SHA-256: dd4d98cf2ac0c065f40059b0fa6834a2d27af6bbe2aa0e048f62d21d08f2abe5

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