Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6a93dbbc46c5f1…

MALICIOUS

PDF

87.0 KB Created: 2021-09-07 17:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13360ac804be00d0e40301b27f348c83 SHA-1: 681374415d8da338c0a9e0a215dad3be81882748 SHA-256: 6b6a93dbbc46c5f1d9175a2b65ff5503b9edf4ef84ee11521a12951be174ab12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest a phishing or redirection scheme, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/5162229acec9df78af103fd41d5532de/46731406337.pdf In PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/mosobogisofefe.pdfIn PDF document text
    • http://longthinhphat.net/uploads/files/dejazopiwuvumeze.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/joxigesinopozesufuro.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7e06a9ae7e60ab59a9b8ba46fdb7d95/23503048264.pdfIn PDF document text
    • http://studiofelician.com/userfiles/files/wizepawijovuribajivozenof.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/purit.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/11426747001.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/90183856328.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160744199bfc33---8878165589.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/42823546747.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/88536595434.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/vfa9jdbi30i0buo4h317r5tt1a/metigim.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160881d2e641e0---jizexedotafenelekuf.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/25915830842.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/f54fa7b8fd8d968347445a16954f28d5/57983095391.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/xagogazutokijabodezifugi.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/lomatu.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84391e6fe---setum.pdfIn PDF document text
    • http://adasbruiloften.nl/userfiles/file/bukapemupavoratilopubefut.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/ravexidomebinikinenedumu.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/43998462131.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/98674883534.pdfIn PDF document text
    • https://totalmediasolutions.ae/ckfinder/userfiles/files/neson.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/39357734002.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/02170623318.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/biruz.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/l0em5abconqk1vl872qccovkuk/97434702121.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=software+development+for+embedded+systems+pdfPDF link annotation
    • 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 18652 bytes
SHA-256: 8b596073dd26a500031dac24c1785987017829c708b64ec1c47f4d5ee413abdf
font_01_sfnt_off00011c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C96 11048 bytes
SHA-256: df5a6158755076fe0db76a5b81b796cb982a8b6a4c8cde464bf5b2a4a5821f67
font_02_sfnt_off00013628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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