Malicious PDF — malware analysis report

Static analysis result for SHA-256 da52bde6562f42de…

MALICIOUS

PDF

78.7 KB Created: 2021-07-29 09:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 888a5af4ef77c428246d9cc56db81511 SHA-1: bd840df6ef69e8d89a1bc24b90e8a4fadbaed6d4 SHA-256: da52bde6562f42de0b05f87a35c44d419b8404c7a5d22846e92aeab085b45ea2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised WordPress upload storage. The presence of numerous links and the nature of the hosting suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://meyergarden.com/ckfinder/userfiles/files/89949489022.pdf In PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/ripuje.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/relidijonoli.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021062711491373499.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/9383632880.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/setosiwibegaduro.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/16078e34fe6e9f---lazuzezafoxerojetazavepem.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fab1b979f---nixigorunevewegawurafifad.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4038f16d2---45023619574.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/34385577929.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1c31b6252381d3994c3d941dec4960eb/36039288221.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/fb3ku4ufu6t33kjaqr6pc59e0k/38148832832.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e55fa87995---41202503702.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0eb5a1206---84130548074.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/85880060480.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/11812497303.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/gutisenagogenizor.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c833e144ed---7912523078.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16083656943652---26330872746.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/se0thkuks41j1pce4v8072hphv/zelidimex.pdfIn PDF document text
    • http://flexa.cz/docs/file/43871219390.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/25531190552.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/710aedb88a3f74bb7060cc4bd68cd800/25386794967.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=mecanica+de+fluidos+cengel+1+edicion+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC633 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE40 2064 bytes
SHA-256: 5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832
font_02_sfnt_off0000e780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE780 10740 bytes
SHA-256: 41140a48d8f5e82186a21434990327080146ef02bf3bb544e81494977f108bc1
font_03_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 16888 bytes
SHA-256: 95e7cf61b5317cdaa5b45026cc003da9a32d5135340a0a363735b1ae98cecbf7

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