Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a4209e761b9537…

MALICIOUS

PDF

77.6 KB Created: 2021-09-01 04:37:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5bcc710b7b82e0f4e9d2728aa583fd2b SHA-1: d073d1c5959fd43f7e4b319ea7a57d45a539b719 SHA-256: 75a4209e761b953783c80922dd37b064b5a66b9c83b3819b791c65e6a6888e4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites hosting other PDF files. This suggests a link farm intended to manipulate search engine rankings or direct users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=croton+drooping+leaves PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/9ughcek80an93pp0qe9la61l4n/vipajesisotunopakesapogob.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/43j6b0n71rtkg4jme0rvdndfpg/pinuluroboxisemujuwus.pdfIn PDF document text
    • https://alutat.com/data/file/duvok.pdfIn PDF document text
    • https://cape-electronics.com/media/file/79184612941.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/aa7l732q89jn421caf56du1eu4/23920193973.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129f6165dce8---detipeluwaborojironaponug.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091526ea4e11---3825318531.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/mizesa.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161264bdf003f1---zovajavemab.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b476909d4---96751153816.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/19b51b7ef1e8d964110c98ed81e3e18e/32933960490.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/99446561445.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/2390584d6b445f2006365c9286ef6cb0/33582091082.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/70721568525.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/54309120298.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/84834427006.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/vilopos.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/30676181219.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/df1d38bda507de9df939b2b2334aefab/51152073450.pdfIn PDF document text
    • http://standdominica.org/files/files/97533591125.pdfIn PDF document text
    • http://omg50yrs.com/clients/6/6d/6dc66c997efb3e4e8ce6e6e7d0694e91/File/17105713071.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b06aff5920ac5fdd78507db75b6a36bc/nagamomezilamapezakisit.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160822be74f299---damidugufexevobalizujerir.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/jetozamo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/91453757192.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_off0000cafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 17280 bytes
SHA-256: 172513c48140dff51f228cc2a79ad2cb2323efad54bb7cd621b1643e7c316f3b
font_01_sfnt_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 10664 bytes
SHA-256: 8eb4001bbf405c9ce595fbc012038b20a69358e7c9e7f9af76a67fe46fee92db
font_02_sfnt_off00010fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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