Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac0bcb666441743…

MALICIOUS

PDF

71.2 KB Created: 2021-09-07 05:58:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8aa30e4290d340360da2fdc448dcf51a SHA-1: c9f9aa4d7b21f3665b947448282df4589098fc71 SHA-256: 9ac0bcb66644174337c14fe123449568890119977d3fa94799bdcc2e3a944e00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to external malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=colloidal+dispersion+in+physical+pharmacy+pdf PDF link annotation
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/q09m2ce7nc1uuifh9s7rscag7q/wigoxufeviruju.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/supiwubegesuwojinetapuso.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2556cab5f---44515763709.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/11136879451.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/d272158f0aa9204546c53f77633fdb23/71379745162.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/2482789023.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/9092d16bbd7e6003e70a061381947de8/dumaloxubawu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/wokus.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/sakejusum.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff07a06f82---gefozinanepigiremezofimak.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/94351398344.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/rokopudosetefure.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/hdo5ndugs53cl7mr0062pl5sko/voturidex.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/turelusagewuvexazewub.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/h3kpkmemra87r17qk2v9a2n508/1366934507.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/wowisov.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610d14af5ee6d---74634895430.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/27077612983.pdfIn PDF document text
    • https://equantumconsulting.com/files/files/kevarotaxupiwelimadaz.pdfIn PDF document text
    • http://cartopack.com/Images/file/juworagosobe.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/50243466912.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/18580978418.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/177a8024f08cf32493f7bccfc497efe4/kurenusunezimipa.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/12685664974.pdfIn PDF document text
    • https://verredistri.fr/xmedia/file/nijotixigevagiwukul.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021052116545970554.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/89523656494.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_off0000b733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB733 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4A 10932 bytes
SHA-256: 6256e98d6952b68be8bf1f0133bd4736ce3288cd90d511bda00ae7a74461b15f
font_02_sfnt_off0000e866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE866 15160 bytes
SHA-256: 0fdd345ead49e2ea0caccd13dbcf0a8342305d6e33de5bf3a36417a84108833b

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