Malicious PDF — malware analysis report

Static analysis result for SHA-256 817207dee2444f2c…

MALICIOUS

PDF

104.0 KB Created: 2021-08-15 18:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b1852617cda2b61f68e9c12e0ff2a70 SHA-1: 0a5d7736a23d30bb6ecc918857f45f0c204311b6 SHA-256: 817207dee2444f2cd325edce85c49ac460010eecea022b741ebfeb0dc69069f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, a common tactic for distributing malicious files. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to bypass gateway security. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • 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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc247f41f---nabokeb.pdf
    • http://dietetyka-24.pl/images/files/ditowimurozugeva.pdf
    • http://lyzjkgm.com/d/files/puwoxutilere.pdf
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c318188a0---99793495315.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925fa1dfd80---dovenoki.pdf
    • http://n2nnetworks.com/files/others/zokuderavulavilufu.pdf
    • http://townofwinslowin.com/flash/townofwinslowin.com/file/51342184572.pdf
    • http://novafish.it/userfiles/files/66841644913.pdf
    • http://thegioidahoacuong.com/uploads/image/files/sonugoje.pdf
    • https://nadinerogger.ch/userfiles/files/35972199773.pdf
    • https://contact-house.com/fckeditor/upload/file/70597351114.pdf
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9377cba2afc3620d59734dd238020585/29298854057.pdf
    • http://balone.net/_upload/file///gidadib.pdf
    • https://piuspvc.it/userfiles/file/83019856580.pdf
    • https://syteq-pro.com/userfiles/file/bupuraruporedab.pdf
    • http://ingenermarket.ru/userfiles/56753419678.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3910fddc0a---tomobumimeloleruru.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u0uua5drur4slfh2vs9slr13d3/55440061158.pdf
    • https://juegosinflablesarizona.com/files/99340513914.pdf
    • https://gamma-electronics-eg.com/userfiles/files/gumorumusobinatidotupefe.pdf
    • http://bearings.vn/images/ckeditor/files/7879065332.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0da4ea54f4---62701157011.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/2e4729bd8b344dfe96f10dc261362708/fewoj.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088dcbdbaee3---forelopirafiviputumifip.pdf
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/fumara.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=smithfield+spiral+ham+cooking+instructions
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012a5b.bin
18d482f46674de246340b2434600ddf5f289c02e1726dc8ca556cae205011305
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5B 19640 bytes
font_01_sfnt_off00015cad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAD 16792 bytes
font_02_sfnt_off000174c4.bin
b2c17e85a29e1a18546a9b9492554eb3671c9ee9b4bbdaee3e9e9464a9eae7c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x174C4 11332 bytes