Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c9a646a6724991…

MALICIOUS

PDF

86.1 KB Created: 2021-09-02 17:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3ab8ce15295b0b1bee8c86dc1e79e880 SHA-1: aa7248ac0bb72e42516f2991ea7997841bd73ab6 SHA-256: 18c9a646a6724991905b9ba18e13819588e0f0c885e0e1f0f4050c990462b6d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=accident+causes+and+prevention+pdf PDF link annotation
    • http://montex.pro/uploads/userfiles/file/zumegipuwotadowujikisax.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/vlbinj2eb78i3ceekvm00ddarh/71402169468.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/90947608842.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/biratawituzufibezuxa.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c325af1a55b---zasepuwidizukowazedir.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/getuviworixesozafisawupa.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/3805834198.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b187821faa6---vifinovunugefapusixovola.pdfIn PDF document text
    • http://coaching-scolaire.net/userfiles/file/77570754023.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d862afd6181561d578a46401994d34e/23511811791.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/guwumepovam.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7k6glu375hoavr6cria2t5j854/9497308793.pdfIn PDF document text
    • http://stinpo.com/ckfinder/userfiles/files/jujesuvetirixuwefidu.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/tolonirebo.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/97736285715.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nkcbi7ev4o9n8oa3ve0qq2sv74/77038684286.pdfIn PDF document text
    • https://soechi.net/userfiles/file/baforetepikiwamuwode.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/pufotojowuzuv.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/nibidujovurifowotesemogo.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210820_441B67A299494F38.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/dotebegaxesowa.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8ef0f1a4ffba4bf55233e8f086ccbd37/36160740064.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/nf0uhrv58su2dbgmdobd3bnpb2/40913484273.pdfIn PDF document text
    • http://bndweb.nl/upload/files/zomevefinir.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_off0000ebea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 17764 bytes
SHA-256: 67a10e73912457ff209b83533df02f9d2d91682036a63247dcafc98881c3d126
font_02_sfnt_off000131fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FB 10712 bytes
SHA-256: d782a64da0cb459751297eb98e1f1a7840923986d10f90f782851f5ec8428315

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