Malicious PDF — malware analysis report

Static analysis result for SHA-256 812dc5b01140794f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 15:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a375494456095128f85959f8adbefb6c SHA-1: 702466885f55d62b52dcb402d2c378f3f55fe278 SHA-256: 812dc5b01140794fb70f8ecf3f221c27363615d41d9a56a0cf8c9c270038f724
204 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains multiple links to potentially compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document also impersonates a cloud document lure, encouraging users to click on links that lead to other PDFs, likely as part of a phishing or malware distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://nutronicltd.com/userfiles/file/lenagurabufevatapebugavi.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/neponadixixufulafamiwugot.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/gibas.pdfIn PDF document text
    • http://ktcz.eu/files/files/goguvebufinarireretasera.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/95746804599.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/326cc49a4d3ea5071c18e4108ae095f5/gawusiralejukakerumusa.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/fegaxijevavusomavok.pdfIn PDF document text
    • http://mauthietkedep.info/upload/files/nunufamobobapemasugakug.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/70695063538.pdfIn PDF document text
    • http://goodmax.ru/i/files/79265381525.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea3f8a3b1b---54313855464.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/74979294159.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/54650349754.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/nidepezozumaxopuloguvup.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/91553881383.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141196cbc456---26342814731.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/92622069258.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/49257445961.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/50876974431.pdfIn PDF document text
    • https://asken.as/bilder/file/gejevev.pdfIn PDF document text
    • http://hakanhurdacilik.com/userfiles/file/3133859205.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109100401427668.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+transfer+iphone+to+android+dataPDF 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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 16808 bytes
SHA-256: 6c7fd50d6451e437b0d84059f9deaa019d5e2401fecb0b24c4ae36d6b92105c6
font_01_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 10628 bytes
SHA-256: 2d3f803c9e6078bffaad89b48597e0eb42e6f59db5e7cb667675cebfda11b718
font_02_sfnt_off00012115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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