Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7397630562a7fa…

MALICIOUS

PDF

105.5 KB Created: 2021-07-14 01:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 58fc1b6ecd3ee0bced202b4383226f8f SHA-1: 12034d53f5dbdb22a718cbe58283f82c3b5cdb5e SHA-256: 8f7397630562a7fa55ca52ed689867d52c493bc2a3c39dcda5c38490d61237ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the extensive link farm suggests the primary purpose is to redirect the user to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://nomylo.ru/uplcv?utm_term=road+trip+andalusia PDF link annotation
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dcb4cf89a27---budogasejolujegiwanaxo.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/02afad97bcbc391596849579b6de8289/35564838791.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/80234748260.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/tiwejajukusawab.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7v4kfdb122kk17fkv0atr6o8v0/tezabisubimaninumetofunu.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/ludufoxezek.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb7de40109---nuxudujabogeg.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mapunixosuf.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/69806855286.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/44517300806.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/fidinixewutir.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/saniko.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/wetojikixatup.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b237ba014e---30246425526.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210706_F81FE30303C9A60D.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/66805504781.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae2ba7dd96---85981185565.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/31443919666.pdfIn PDF document text
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/51f63947b1f34f975cd183323f2bd3d6/42550720554.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a7d48b740---83815467361.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/77637509745.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/95427297776.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3fa4dc30---75652224426.pdfIn PDF document text
    • http://aci-immobilier-douai.fr/userfiles/files/wegedosamekub.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3ab89b2fae598b0c7a87caa2ddb7f90e/85549546056.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12269 10400 bytes
SHA-256: 611568357781fc2f9078dacf97b152415e8ae15475a425a68a5b0dc16f48ef93
font_01_sfnt_off00013a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15218 17020 bytes
SHA-256: 3ad56f45df98c31e09f108004268e7c5b76d9203059d0620b6871073c2fc07c6
font_03_sfnt_off000168f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F0 17768 bytes
SHA-256: 2415d3a443f4f992170f70a850a5cdb4d0e1485ebfe8eb039645675e862b4550

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