Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36a3f846c830066…

MALICIOUS

PDF

69.5 KB Created: 2021-09-08 05:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb0c803ae23441c5da7e13697dbef9dd SHA-1: 1c5324412ffbf340dbea2dad8082d645935e2a74 SHA-256: f36a3f846c830066279636c23b687aa8abc2993052c175752c7c5f9727e0a30f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to websites hosted on compromised WordPress installations. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ef10be308---93123442923.pdf In PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/6b05bf2282691e31492347429a6a04ad/bugadikawalobadekumatomor.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/99622764256.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/68265774958.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/29483776227.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/7ebae2qat9j5p3rqgdbebguum1/kezidaterilakowewi.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/64728942970.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/vpbj0a4ai7gbmfc5sofggq55j1/jabezurakowazeri.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/mizefarijikososik.pdfIn PDF document text
    • https://n-vv.dk/userfiles/file/mepulitomizuzen.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca04281b8e---wemozifejiti.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/xanijulosaj.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202108020635383976.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/36d1e982c54d63caea39b2e7958b2008/62650926500.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/93207528725.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/jexewakoke.pdfIn PDF document text
    • http://vendsol.com/userfiles/file/38781836665.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca06cc389bd---meragun.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/memawaruro.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/files/vikawumonufuti.pdfIn PDF document text
    • http://bryanhigh78.com/clients/72554/File/saxip.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/96587311060.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16097e474a43f2---97632307898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=frigidaire+fpid2498sf+manualPDF 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_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 11276 bytes
SHA-256: 8d77c6772583cdf8257a00d0c67b2b469345cc72bd16df8ad90d7bd83604617f
font_02_sfnt_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 14492 bytes
SHA-256: d5fecc5a918293f3d379bd40cec60c2e19dc181d10055f7a815fe66d4998dbcd