Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7edf7670f980c7a…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 09:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd6f5c6f8c89c06e1b767f6d9ad34f67 SHA-1: f7ead6c5227e310a5bdbe10b818687ed6f7198fe SHA-256: e7edf7670f980c7ad84ce40f0c4ab247a095990680e63a8b68576dd62d9b408e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a remote-support tool lure. The document likely aims to trick the user into installing or connecting with a remote-support tool, potentially for malicious purposes. Multiple URLs are present, some pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm used for distribution or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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 https://madspot.dk/ckfinder/userfiles/files/13082328699.pdf In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dabb71edd---todulokonutigevomozulelag.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9dbc911b1c7846a4d75bf4c3a2ca68c8/19139083200.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/64618284488.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-8/20210908181948739464.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/puposiwovezir.pdfIn PDF document text
    • http://terwaarde.be/ckfinder/userfiles/files/gatomoniper.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/jetafodepulibonapa.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/25732611513.pdfIn PDF document text
    • http://bushurov.ru/images/files/51063787704.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/9668961208.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/3f875fee97d502a75506409a1d42972c/87153505635.pdfIn PDF document text
    • http://explosivedevices.ru/media/file/15394445239.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/3668503419.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a41f689e1---tikoketesagovesijodigib.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/5568545678.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613d960b7c2cb---6440298264.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/49440241278.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/50477508294.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zafeluwaw.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/24899678075.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/pabugajinomo.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/5607442309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nook+hd+android+updatePDF 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_off0000cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB05 10444 bytes
SHA-256: 85a6e95cd4f4bf46dc353bd8b8cfb0b826ab3ad43dc7af3c1f9fa0c3e720fcc9
font_01_sfnt_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 18244 bytes
SHA-256: 98b32e81ba6c2b6979fe8e2921761475cc063657c111c54194350565bff7b7c1
font_02_sfnt_off0001128f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1