Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9151f4f49a16c39…

MALICIOUS

PDF

87.6 KB Created: 2021-07-06 00:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e299162405ba110f01976caa8980eb5 SHA-1: add008e89bd10d0de4495422e4387f8fa1fbc866 SHA-256: d9151f4f49a16c39b81995dc96bc3edd5788e87b95b95f8d04f24d35d7cf74af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous disposable domains and compromised CMS uploads, indicating a phishing or malware distribution attempt. The primary attack pattern involves directing users to potentially harmful external websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://easybuildapp.com/files/uploaded/files/zotigololaderobasipepi.pdf
    • http://syuncyoku.jp/upload/file/rewogakovonobo.pdf
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ea18b18ab492a7d6f2b9aee2100d2ad8/nozetanigafaxutilolebata.pdf
    • http://mp-journal.com/media/file/sadadufuzebupibevu.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2vve68qfc970oh1pjcrj6irv9a/69525438254.pdf
    • http://reutlinger.pl/userfiles/file/4109109084.pdf
    • http://ahcxdq.com/uploads/file/290747009720.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/51f82103b0bb1e4f53012f0bc79c4d6c/repejugofozo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/31368983873fd3b720fa5979df2c6bc1/97832293361.pdf
    • https://economiadecomunion.com/ckfinder/userfiles/files/xoven.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160afcaec05b1d---79865040726.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c740d7f4c7---luxuxepuvo.pdf
    • https://cardion.dk/gfx/fckimages/file/jodozojolada.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/bda458d9db81b1ea245823aea1f54a82/74766769262.pdf
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/07ce76c61b6369bfd704a4965ccd6375/53273187086.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/g1kjo2odc9t63umq119f8luq9m/59211189577.pdf
    • https://natyabio.com/uploadfiles/wolowebot.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609375467dcdf---xanebepasofego.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfb6c9f5f9---52675385022.pdf
    • https://lawyerupsmart.com/tempimg/file/2456809651.pdf
    • https://anmimar.com/royal/userfiles/file/riketejojowemozexaforidox.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/55e9f1bbeb4979f9a326e97c0598f061/zupen.pdf
    • https://airbays.com/userfiles/file/65109244006.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=i+am+looking+forward+to+your+call
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f544.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF544 16792 bytes
font_01_sfnt_off00010d56.bin
2af6fe4a9b95e137dcfed09894cc66ea91018d20b7d9378591367b40e29ca3fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 16668 bytes
font_02_sfnt_off00013871.bin
cb3b5a0648d476accbaf097cea4f2fa261e30d095bf01e3c4d57b198a2512fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13871 10860 bytes