Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1b825b00478b5a…

MALICIOUS

PDF

78.1 KB Created: 2021-06-26 04:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4d1cff3b174e6ac765834ea0775aa91 SHA-1: 4298bb112deedbe0c1600cae17058749d5709407 SHA-256: 1e1b825b00478b5afb526a735cf225c0b6eb5895f48c40c656c9752a1135a110
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, with links hosted on potentially compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609100e8080b0---kowigolujuledabosobuxiwo.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/ab4d46c43394be294fecc5bd0c7fd314/77706864949.pdf
    • http://automsystem.com/UploadFile/file/20210506223652226.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8bf622a67---56547806222.pdf
    • https://alarrabnews.com/images/content/content/file/vokokatajanupipaf.pdf
    • http://wienbildarchiv.com/upload_files/files/34421985041.pdf
    • https://ferado.vn/userfiles/file/pidijiguvub.pdf
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/200254370d8ea756a962618fbb10c72a/57113189048.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/2fb6614908e138150ccc0d4df19c02f3/welamipivagal.pdf
    • http://budohurtsa.pl/userfiles/file/muzutikotozapemoful.pdf
    • http://learningkey.org/userfiles/jenoloxixizadaperij.pdf
    • https://famecosmica.it/file/34664965566.pdf
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/0b587eea7f1a7567d1e71d925f977684/55110491581.pdf
    • http://ekolojikweb.net/upld/userfiles/file/nojikige.pdf
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/naxetipu.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac1d1499f3---31670808035.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16076e4333acc1---sovora.pdf
    • http://backupcenters.com/userfiles/file/sabokadasakukogopufepal.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a7c77b25185d33974c70f6e8a083af31/95449412527.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089060abc22a---20553556532.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/59946b0e2d3601f5bd2ba195390402e9/34597447181.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8o17sqctchbj6s36rtdvp9t1n4/11878559401.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/o1u6llrv1l40a23ueptbh652pv/43136687360.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9df664da6218ed24b35ba2f815ac39c8/69486799129.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607137ae52dc8---leliwapokada.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=red+platelets+high
    • 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_off0000cfdd.bin
0a8b89e6d371940877837b77cd58d8f10d250574396cce9afea66f084435e562		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDD 10392 bytes
font_01_sfnt_off0000e74d.bin
a56c090017d8df5cbdb2d5704c852387372905800a319b3b3a8fab6d575f40fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74D 17200 bytes
font_02_sfnt_off00011358.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11358 16792 bytes

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