Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b2e4190a26c95e…

MALICIOUS

PDF

127.9 KB Created: 2021-09-01 02:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cdb8372ecebad9b8eff052f02a9b1e0 SHA-1: a49c50b4c3eb3af9682a4cab4508346eec178a16 SHA-256: 20b2e4190a26c95eeca77090f542c7cf4a73165a9b03e3b577e0f2accc74e864
212 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm pointing to compromised WordPress uploads and uses urgency lures and download button lures. ClamAV also detected it as Pdf.Phishing.Trojan. The presence of multiple unknown URLs, including one hosted on a compromised WordPress site, suggests an attempt to redirect the user to a malicious payload. The document body is heavily obfuscated and unreadable, preventing a deeper analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160783962a5ae5---vutizo.pdf In PDF document text
    • http://www.farmaciapenil.es/userfiles/files/51723826754.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609de534f21cf---21576175633.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/vurefojixopikegin.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/183469859960d8dc684b35a.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/nanavel.pdfIn PDF document text
    • http://unsersohn.ch/images/file/70924213681.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/liraro.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/70adf9f560ed932513b0df5d0679067d/86359076392.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/ehkhhq568ah825f1afsk0c87lt/nufenesanovuleget.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/18562932056.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/vogatarixufipegidan.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/bozufawokimomofijanobus.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/wewuxofiworog.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607405a75d052---nodilep.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/basapegiv.pdfIn PDF document text
    • http://webursitet.org/Files/file/buxatene.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/61377788414.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ojl5fl2v0tkmit4tt93ulc8pfu/sajapofimabip.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/bulakudesara.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/femetuf.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/2237450324.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/chrpj9ve6qpiardk2vfu6dm7cr/lasov.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/ziverefofewupuduge.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/9014748607.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161098b9671482---bokakituzitulogitone.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=blue+is+the+warmest+colour+full+movie+download+worldfree4uPDF 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_off0001837f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1837F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B96 11124 bytes
SHA-256: 58a76d07d102314ce96c55c5347ce86032b7f21749ddbf00c4d2a945d36196b2
font_02_sfnt_off0001b587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B587 22248 bytes
SHA-256: 672f6deeb0bdc648a02805238ebde17965d7abc110dc4f7690b29b523b0a85ae

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