Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f4fd4733359b6d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 05:49:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f641f0ca059417fbde2f517289b08b28 SHA-1: e148841ef041e161baae02d5c5a52c1005dddeb4 SHA-256: b1f4fd4733359b6d87a6007b7ca05868cf94f9d84c5a860ef7adcca07587a657
156 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also flagged this PDF as malicious, likely due to its deceptive structure and the nature of the linked content. The primary attack pattern involves luring users through a seemingly legitimate document to click on links hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a8d2dd0ab---64798681336.pdf In PDF document text
    • https://salvatoredivilio.it/userfiles/file/soroditajek.pdfIn PDF document text
    • http://royalgroup.at/tmp/nelokagejepekivulu.pdfIn PDF document text
    • http://cloverdiamond.com/file/56392772860.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/34845095741.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/merezomagaxulaxukebasam.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608593f9a90a6---lanozoxuveza.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zumamumepilipesewa.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/xozubamutoj.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1899665ac509f16233a731af10b0c6b9/48599491822.pdfIn PDF document text
    • http://u15.ch/ckfinder/userfiles/files/11202231254.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cf07bb184---vigisu.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f99197169---99904909273.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e702b0d60---58604068269.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/50671075365.pdfIn PDF document text
    • https://quizai.com/uploads/files/30222765267.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/botaseso.pdfIn PDF document text
    • http://owtsreunion.com/clients/e/e7/e717deb27d844c69ffc49b2d3c0bb1a5/File/zepobudopikurugojidiril.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074baeab4f8d---77410688218.pdfIn PDF document text
    • http://webursitet.org/Files/file/nebavikejetatawub.pdfIn PDF document text
    • http://snsi.jp/image/news_file/86546749986.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c35f87a35---58990427298.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160f090032b682---tegamuzefa.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/8921990518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=vehicle+tracking+and+monitoring+system+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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 16516 bytes
SHA-256: d53a2b99ca164804f4bbbba021e882eb3d4248bb167caab531dfe05287fd8a81
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11240 bytes
SHA-256: 9ca9d1335f76fa6a8295f00ead3e04fa689068281d639dcee3a7e80e115b815e
font_02_sfnt_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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