Malicious PDF — malware analysis report

Static analysis result for SHA-256 63f6168c067d40c4…

MALICIOUS

PDF

86.2 KB Created: 2021-08-21 00:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ef44a3b88c616a1751e32d4fafd09a2 SHA-1: 60b1a902b1ee05db062d2787c7156b1fac18a39a SHA-256: 63f6168c067d40c4cc204c65964c9e6cfc8a1a9556546dfab336149d3e03b6dc
164 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous links to external PDFs hosted on various websites, many of which appear to be compromised or disposable, suggesting a link farm designed to distribute malware or facilitate phishing. The presence of a 'download button' heuristic further supports a malicious intent to trick users into downloading a payload.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608e92e433528---98881575677.pdf In PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/so7oo60cecpteldct8b1eqeh55/49155215835.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/8084728075.pdfIn PDF document text
    • http://mtsskzy.com/userfiles/file/63957268361.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/welepulijevemelibijota.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d797c51f---pazepivovu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/pamebazosinisoxonesode.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d4fdb0ef9---pifarebarusudifefile.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/8903880381.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b42c4fc4088---42229138997.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a8b12ad8a---xeturozurorulik.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/dunedeza.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/jhijo3d2imediko1r9ds1thbtv/13293625378.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16100aa6814061---xubidawapisiwetimo.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/xezakus.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e0e293f04---vosoxe.pdfIn PDF document text
    • http://ortetel.de/kunden/schurig/ckfinder/userfiles/files/fakubaf.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/dofetabugewosoxanas.pdfIn PDF document text
    • http://hkwwta.org/userfiles/29604530.pdfIn PDF document text
    • http://kururlaub-ungarn.de/bilder/files/17184045989.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/46658453386.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/powabujilegudolip.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/15854060056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+activate+cancelled+gst+number+after+30+daysPDF 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_off0000eade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEADE 17236 bytes
SHA-256: 176e9f27b256508d1dd94baf05b6c21fb1377b032e744e797c2fa3da908bca40
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 11612 bytes
SHA-256: f741031945d8b9001a8fa2f4f237021a8293316d658b752b34a6cd7bc73d320e

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