Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3063a0bddeecc0b…

MALICIOUS

PDF

139.2 KB Created: 2021-09-06 09:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f6e7aa5fe971db7ae5ef2e99811b2be3 SHA-1: be739fdaaa3ab46a49a4fd57aadc724821f85ea6 SHA-256: a3063a0bddeecc0bbbca57a005df32d003384d85f1928b4dd97c21951edcc6a4
244 Risk Score

Malware Insights

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

This PDF document was flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be disposable hosting or compromised CMS uploads, suggesting a link farm or distribution point for malicious content. The 'Clipboard command execution lure' heuristic indicates the document likely instructs the user to copy and paste commands into a shell, a common technique to download and execute further stages. The 'Password-protected archive handoff' heuristic further suggests that a payload is likely encrypted and delivered via an archive, requiring user interaction to decrypt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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
  • 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.
  • 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 https://laborke.ru/uplcv?utm_term=everyday+science+books+pdf+download PDF link annotation
    • https://kurishupally.org/userfiles/file/vitor.pdfIn PDF document text
    • http://aimic.com/userfiles/file/patolepobizuvinufujimes.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/valiritevasuwani.pdfIn PDF document text
    • http://demkapi.com/resimler/files/35205328614.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/t95kn3hdsrl9kvnmcppkdq63ot/2049999100.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210728_3E7B8C16A52A3053.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105e380d76ef---wuvibesixupexuxuvas.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202108132355275913.pdfIn PDF document text
    • https://tessuno.com/upload/files/6105530d06780.pdfIn PDF document text
    • https://hanahana.vn/media/ftp/file/31311824350.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16077c83b0d683---bulujopivelu.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a479a4d12c7---zilege.pdfIn PDF document text
    • http://irollee.com/userfiles/file/falebobizirorumun.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/52869010754.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sujivewatewezarupatu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/3e18eba22d0a296793303ab57bbf2eed/jaxozorudodenupadorade.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/ximepaxawupokanutaj.pdfIn PDF document text
    • https://ienter.bg/files/rewel.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046481cf4af---7263996904.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d061640e2d2---54228561425.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a141b082af---51805408552.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_off0001ae8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001c6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C6A1 23948 bytes
SHA-256: 6e5fe9365ea76dece9ae1c9449a485f7740579471e939ade910e1743987ab871
font_02_sfnt_off00020576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20576 10996 bytes
SHA-256: 008d063865298534b87a02e387269130472f675dfc9fc28c712e3bfa6f318194

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