Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c0fc160a2c3db…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 01:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 805924ef1749f0e59568987aefeb7a07 SHA-1: d23c860b67fed26aca278b658d373ee0e07dedf3 SHA-256: 552c0fc160a2c3db82d4899caa8aabeef3757f5682dcf87509f3b6c761e4fa39
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous links pointing to compromised CMS upload directories, suggesting a link farm designed to host malicious files. The presence of external URIs and a link farm on disposable hosting indicates a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure and URL findings strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077137706c37---gapufe.pdf In PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/85600832489.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/ximenitikawem.pdfIn PDF document text
    • http://robedecreateur.com/img/files/48376612733.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/soligo.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/58ce318477502dfce9f41144589a3d74/xasorabaxijotiwawokoda.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7b403fc388a9e027985d1a4c08ee179b/58351823870.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/wafiwiwaxepafamifatuxek.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03c69d26b---70950346308.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/98441995014.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/jifanokerofuwa.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216301331188689.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16099dd590628b---degoxoduviwiwena.pdfIn PDF document text
    • http://metallpress.info/files/18995908820.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a9b59f45a---63074349366.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/gejawebuxezoxuseniwegivax.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/wefiwinatelurerameki.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/82327084220.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88e2b3a1a---5992746114.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/83404506209.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c84258144267fd6dfb5f5507b632db9e/vokevudujatafuvapubon.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/80659429643.pdfIn PDF document text
    • http://miraesusan.com/ckupload/files/kopaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=think+out+of+the+box+questions+and+answers+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_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 20716 bytes
SHA-256: 9f009b63548a36e9e04bd8075d1a432216f99c795aefbe8dce972801fb0d076e
font_01_sfnt_off00012035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12035 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001384c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384C 11176 bytes
SHA-256: e117d00a8037f3a462489242948f66cca2babf7f7b6d56c232bbc801ed3abdc0

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