Malicious PDF — malware analysis report

Static analysis result for SHA-256 92697e38d3dbbffb…

MALICIOUS

PDF

304.0 KB Created: 2021-08-18 22:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c52030bf4f57cc042c648485d4a3c785 SHA-1: b9f1a5cbff809cd91386a0e5107671ba31108879 SHA-256: 92697e38d3dbbffb60732777d2ab41484a323d5cdad79e53a477bf43a88db138
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF that uses a lure related to invoices or payments, indicated by the 'SE_INVOICE_LURE' heuristic. It contains multiple embedded URLs, several of which point to compromised WordPress upload directories, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9162

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://vinamex.info/uploads/news_file/81312511783.pdf In PDF document text
    • http://cpils.com/userfiles/file/37299429998.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/mevizosakufu.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/57766803435.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/42449106146.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b0cc24be---28606976102.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/89506147634.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/86600284120.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086040a89195---kojojuweno.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848d26acdec---50502425055.pdfIn PDF document text
    • http://haihengpharm.com/upload/files/81433180270.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/junavipizorasotodum.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/28884114866.pdfIn PDF document text
    • https://laetitiabernard.fr/images/file/56336198055.pdfIn PDF document text
    • https://iohrp.org/f_files/files/32206459779.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/16e6a3bb816d267b48f65448bf100630/musonix.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/13667635020.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611105be4465b---61838402778.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4d987f9f---fijarawafijemeguminavomop.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/62946724694.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f0240a9b878---megominedojugil.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/nozukowuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+santa+claus+got+his+job+troy+kinnePDF 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_off00044d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x44D3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00046554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x46554 11160 bytes
SHA-256: 0edbbfe67f008209aeb88ee7fcf666c6d1fec0c5e855a191eed8559208beec56
font_02_sfnt_off00047f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47F62 18756 bytes
SHA-256: 06a37b35db7118be9355120deab4972a829221500d3689c6962ba1ab22f6275e