Malicious PDF — malware analysis report

Static analysis result for SHA-256 85820ede16e4439e…

MALICIOUS

PDF

72.4 KB Created: 2021-09-03 01:49:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 711189fb42d1102564d3125ead6990c4 SHA-1: e714055e5b9ffc5ba54160d5637509c21fc93ed7 SHA-256: 85820ede16e4439e1d5dd41dd9d1bf81024f57a846fdf6ad02b607572c6bf6f6
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://advantagelic.com/singhania/downloads/file/82825068026.pdf In PDF document text
    • http://canigrup.com/userfiles/file/livurax.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/tadobaradesef.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i8ja0naboq1emjn0ljeh0nrdo5/33070154543.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/mebowelexipogosivix.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/43640452648.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/70d0204ec11df7156bc91eb149ba8d66/91503103018.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021073115043573499.pdfIn PDF document text
    • http://onmamtour.com/FileData/ckfinder/files/20210722_8C00200997A4487E.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d9640b326b1---34168236623.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/85181581740.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/a6878aed498dc8f74411064bf6d419b9/kikil.pdfIn PDF document text
    • https://vestol.bg/files/file/jagalam.pdfIn PDF document text
    • http://i-dron.cz/data/file/48686431770.pdfIn PDF document text
    • http://ahoba85.com/clients/2/26/26d353b61ac95a99d7df5001a3d58300/File/jebewewofonidabinikuvudi.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b39085024a---muvepebowudarifitul.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/vujewisojoburewekaxinujo.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202107020812157026.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/rml536bhopnscpsb5qk4jmk3d0/zaligilupaxunijopipo.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f1e780b6f5d70e67ff3ae6228b2f5a09/68464166342.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4984a266---29132752190.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/vaxomujuguwaxoseforiz.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///menefonaxi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/kltnttcol45s3c6kfgfk9adpnp/ruluroxutedusizifigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=easy+fruit+salad+recipes+pdfPDF 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_off0000b976.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB976 16244 bytes
SHA-256: 33a460cfb08d7de47fcc81d972b831359fb348e35317d896304f514090f0349c
font_01_sfnt_off0000e329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB40 10588 bytes
SHA-256: 76805b9a1b1a7e178b6cc6fe7f0969ac1de3b737a1245018570e3334041261d1

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