Malicious PDF — malware analysis report

Static analysis result for SHA-256 9596bc8790dd581f…

MALICIOUS

PDF

96.8 KB Created: 2021-06-29 10:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: af193c114781b88d6d6672b06a656c9b SHA-1: e0458856045a4c8331aefb6334e5193654ced84c SHA-256: 9596bc8790dd581fc675d875f6b724c3bc608a460cd1fc100ab239a3ec6c4c73
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to host or distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/de5261c5812298144e4bd3edbdf17e0c/nunupagapagov.pdf In PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/8711453634.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/lejofafabawuwoxowu.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce3a83fa09---pevibadejekonosiserarawuk.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/18c789dc41fc8a24f13b5d408a6d2f10/91526773971.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9b1500c9---pakabezogokidibadiw.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/wokozevikowup.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/07ded42ebba34fd35fb6360a6c4e327e/malufijajoferifif.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/jebefebomebunotebatem.pdfIn PDF document text
    • http://accountingworld.in/singhania/downloads/file/33214046109.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/98427173172.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/0c73918afe11d4b62f4a2380fbf7c71a/82799055795.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bb06b3bb6---46891137566.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ac875404f---wexurabuv.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f0dbb598---79587819761.pdfIn PDF document text
    • http://www.asslar.de/downloads/savobegeri.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/24118117003.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b87347579db---bubexidanogu.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213917e157---vozegevepi.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/lewevugowa.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc8e21f34---lubinirokobawet.pdfIn PDF document text
    • http://abnicum.com/files/file/63304686747.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/satepatezifaweriregedur.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/kusediwovemunagiwebop.pdfIn PDF document text
    • http://asustainable.com/global/file/kepegogisugikowe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ea7e0a33---lupataloduwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ielts+speaking+topic+parksPDF 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_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 10592 bytes
SHA-256: ac71d22fd04d7f741eb90aa6fc2659095e73b8e88006661ec585876162f0675a
font_01_sfnt_off00011233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11233 10292 bytes
SHA-256: df586795fd279663a53486f132a55e7f3e4534a7ed9071762e6cffda2eb4c56d
font_02_sfnt_off000131b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B0 16832 bytes
SHA-256: cf38e4dc108f57975e86304e3f18ba1de9684d23628119c5712aa3cabaf18029
font_03_sfnt_off00015d5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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