Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8c9330aa9a11bd…

MALICIOUS

PDF

133.6 KB Created: 2021-07-13 01:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 474255abe86d536c9c1ebec761b7f9ab SHA-1: a36ba838de4ec7a4de6e9f995a55ffcab37e28c2 SHA-256: 3e8c9330aa9a11bda24a70bcc2bc283ed5b7cc8faf9fd4b93b22ab560fe3ad5c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2e71aa67---83603393508.pdf In PDF document text
    • http://diamond6ranch.com/userfiles/file/47448499282.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608815ab3dcd6---65250781013.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/40178933264.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/17242209744.pdfIn PDF document text
    • http://canvangdientu.com/images/file/zivivevuboposogama.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ee6c939e198b8703402fe72731566ffc/60607419189.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160911b66865c6---71406101896.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///31669478037.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/f195ffa5bf745a19b386cdf5b70ed9aa/wiponusurob.pdfIn PDF document text
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/78416362645.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16097259314b5f---besorujanam.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/76163793264.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096cfb19e760---vetezibudaxagikimovonib.pdfIn PDF document text
    • http://blackshirts1961.com/clients/7/71/7137ee3fbd99c17d296746b31d66a47b/File/95316385087.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c9d2f3655---gogafejonoxudisivapilav.pdfIn PDF document text
    • http://altus.pl/userfiles/file/72716954207.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/dn9upgi6lrgdvvqaskeifo0681/72373312321.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecad5a03b74---gusukeguginewuli.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/vejenimotaw.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/welovomi.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24600f504---farenulugamabitutoza.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/67220599351.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdacb41202---65444730547.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/12864770204.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc792528fd8---35432708189.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607593cbe667c---tufiluvir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ray+bradbury+short+stories+for+middle+schoolPDF 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_off0001a6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6D5 17996 bytes
SHA-256: 504c9c3c542f2ec1c088b25d96c196cfcf425b5d2aca16c3e31ad00ac4066b42
font_01_sfnt_off0001d65e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D65E 11036 bytes
SHA-256: e76373afbff94863d44c67cc1f4671c05f8b92f61eeafb40d527695f03e7d040
font_02_sfnt_off0001f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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