Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebe8c99864ee7ee8…

MALICIOUS

PDF

83.6 KB Created: 2021-09-01 12:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 276df5a1fd3a9a76a1b46c8da09c88db SHA-1: b67b1b2663ad6f2b8f6a8dc52bedd6cf6aa6c80f SHA-256: ebe8c99864ee7ee8fd201d5060168cf0501fc05311c08c59cf4039c505c2cffa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to other PDF files hosted on compromised websites. These URLs form a link farm, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pemaboutiquehotel.com/assets/userfiles/files/zikodireruxexutavifi.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f61502d30b1---powijusurosame.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/suxebumutivuzakugeba.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610973f210f45---kixafudimo.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd1401020---wosituvijelovejuxuse.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607256ebc20e5---bakojib.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/73486936571.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/80a663701f728c8ceeb8a6d97089c678/13255922625.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/2021072003295849522.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/41234006324.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0aa1f963cb36efacc0627f9fe0098451/66339653669.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/10648956493.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/jizowetajarimizakojefira.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/wekabojanovu.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92897fc41---piwedotiwi.pdfIn PDF document text
    • http://sapaethnic.com/webroot/img/files/97028345125.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/venuturagifafulizuwero.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd374834310---3555214738.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/54254697402.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/90766397295.pdfIn PDF document text
    • https://tourpon.kr/FileData/ckfinder/files/20210811_2EFDCADC1304302E.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/88345753107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=scientific+notation+3+significant+figuresPDF 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_off0000e148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE148 10812 bytes
SHA-256: fd90051e315b97733802af07a4540b14c99aa5ca8222f95d46319275b785468a
font_01_sfnt_off0000fa62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011274.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11274 17888 bytes
SHA-256: 0d2751cc8d195d53a3219b88cdb6d7927fecc9998e3e8b904c4f7cf2edf3c617