Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca2fff43051bba9…

MALICIOUS

PDF

76.7 KB Created: 2021-09-07 05:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 345423095e306bad6fc122ad0a5857bf SHA-1: de3afb6527dedc8e5bb3dcf4aff4045c8d07b74c SHA-256: fca2fff43051bba924a1a0b7f9359f63e1a0ae38dd0053b44c1e2008bb425c63
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious or SEO-abused content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 5

  • 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://pixomot.ru/uplcv?utm_term=volumen+de+cilindro+ejercicios+resueltos+pdf PDF link annotation
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebfa568c5---limetozarekisadimoxunuje.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sggoe7s9kj86642si4b2imqrd3/9613087065.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74cc0109f---39852090324.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083181da2467---89408519794.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b8293eed16---gotat.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/jexalodoxut.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/menadulunav.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16104bd6938abd---83428284593.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/80164087179.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e6df1e3f17---30639111640.pdfIn PDF document text
    • https://maturana.cl/upload/file/wuferelijepapexege.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070aba14b1dc---kipumavuvesamafinon.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16096a7aa80765---38519355782.pdfIn PDF document text
    • http://inncredel.com/uploads/64474488585.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46db3299a4---zukuketuwezuwupad.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/lanagemupesanatev.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/46936713855.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ad7c11f39---60100906977.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/vopudusinebabekajakeratik.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/28317206208.pdfIn PDF document text
    • http://synphabase.ch/upload/file/38135207952.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/49f698de853eb31399d1fe9b7843d1d4/55737440935.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f24bfbe66d---49381679343.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/kizimetupedewopoler.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d04feb18e3---29798123464.pdfIn PDF document text
    • https://linker.tw/files/5026907168.pdfIn PDF document text
    • 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_off0000c5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B9 10820 bytes
SHA-256: 1a5142f99aca4332ccaf9728de69543e20a08c28810e73021e0063df15d783df
font_01_sfnt_off0000de93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE93 18784 bytes
SHA-256: 3829c4f3949565b1e8628169996b9ec68ba0858b590f1ea0698991fb11a027e4
font_02_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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