Malicious PDF — malware analysis report

Static analysis result for SHA-256 4527aaaad24933d8…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 21:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: de7e42fe86d466d40aae9933bf2559ce SHA-1: 78caf8f3ab15f873aee9fa99830d94bd95b1a4f1 SHA-256: 4527aaaad24933d8f0b8bada43125faad5e1432195fdd6bc27a52ddb4db0f7b3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier. It contains a 'Clipboard command execution lure' heuristic, indicating it instructs the user to copy and paste content into a command-line interface. This suggests an attempt to trick the user into executing a malicious payload, likely downloaded from one of the numerous embedded URLs found in the document, many of which point to compromised CMS uploads or disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tpdw.pl/userfiles/file/48013444516.pdf In PDF document text
    • https://projetounificado.com/uploads/files/nowesexasosudolubixiwuki.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/merelojivaxirav.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210725112737.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210616_133158.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/66ce354607024fc464f61d08b9f75b5d/fibejizikuwubinirub.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/85138165024.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/25494879571.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7e94895d---nunutifupodexu.pdfIn PDF document text
    • http://willbramephotography.com/kurasopijine.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/sumeme.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dab49fb3328---rezosowirekivaveronifute.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/3912517414.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/22178049957.pdfIn PDF document text
    • https://tempegaring.com/contents//files/15829996399.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/b13e0ca4ac1e2ff17b862f0f12ae9381/59429443331.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b744fb2fd1b---16515176445.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a0bdaebde57f0aec17bef736cc299964/xabodofidoruvosapok.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vlcrq8sv764856h1enqd8okib4/34965422062.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/42490029242.pdfIn PDF document text
    • http://drive4smilesontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/57530641380.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/tafatapo.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/1bf944cdf836408c67e9a67ba01fbe02/vuwojonelogorepajozozun.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b881af40eb7---75899458164.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/zasotumabuza.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/purarilodusebadip.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/n4bkvpj6dr8bjtbj3dj0sq3u15/37154866033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=unitor+immersion+suit+test+kit+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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF05 18076 bytes
SHA-256: c6c9fc38179242e786f3fcb8967e6b859ee874dcd55f55e7340fb7a4b6002613
font_02_sfnt_off00010edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 17148 bytes
SHA-256: 89aa0a2a04763bf15b5137017231da7fdcf65cecfb6d51642c90db09c28bf4a4

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