Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c8a2b8bc1396b7…

MALICIOUS

PDF

93.2 KB Created: 2021-07-02 13:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a674e77990767f08b9426cf6cdf5ec4e SHA-1: b5fecc07ad1ca15a9494a4bbdf48c75927a44fab SHA-256: e8c8a2b8bc1396b7493a297e27035a18c134f83d8ae9b4c014fdfaecc6f38b90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs that point to compromised WordPress installations, suggesting an attempt to distribute phishing content or further malware. The presence of external URI links and compromised CMS upload links indicates a clear intent to redirect users to potentially harmful sites.

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://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883e0559846---jejoxorudefoxuguma.pdf
    • http://www.findvoters.com/userfiles/file/87505410995.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3a9194208---tirefipuxitokapujawogon.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a933232dfd8---lodozugokagalevibab.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607015b780b30---vegigeme.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0cb89ad17---luvewewulufesunite.pdf
    • http://mamsongdamchoi.com/images/chua-phan-loai/files/98731438149.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf37a7aa6d1---90805668722.pdf
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/wavukifibakutibur.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce769cd5d80---638798070.pdf
    • http://atdawnwelift.com/userfiles/file/65672600699.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/e7f2def3087c0ff0e1a03b0ad3f2a2ee/63888259411.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/47f6bd90c3e64265e710fafcd86550d4/jariwozogug.pdf
    • http://amadpich.com/userfiles/file/17990961633.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/e765alqu755l0nla56c344ca16/89422323470.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/12dcd15f2caa12ecae50642a6a36d05a/kuvenavol.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5d9f49e586792ca7f20a68df6222d7a6/luwitafaruselifigam.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708c68885d1---dumetororojedekidun.pdf
    • https://247christianity.org/fckeditor/userfiles/file/gaponutumerezijejosepa1623223660.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9214dfd31509d7ee82d4d5f9b9c8a33a/fuzevijupuvudek.pdf
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf7bb8d3b---94353908787.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608739563a003---90991992099.pdf
    • http://kalmi.ru/upfiles/files/toderiwabubijimabegow.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/955097b49b82a2e9bd5fad94f7a8a230/foletererilonuve.pdf
    • http://dietmoitangoc68.com/upload/files/61646285570.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61af2a3586---jilirafavuzejogesuviwuraz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=dxb+to+auh
    • 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_off00010568.bin
cf46c24c2948641381011d3c760dc532af7a22ed0c2d03f09d33c3f666e0125f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 9908 bytes
font_01_sfnt_off00011b64.bin
08ae9f7c9215502d914bb56d2af59b643d92aab907489e38839fef440594eda7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B64 21180 bytes
font_02_sfnt_off00014e5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E5A 16792 bytes

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