Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2befba891b81fb9…

MALICIOUS

PDF

78.1 KB Created: 2021-07-06 19:54:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 43c200c5950dd2b577f7f31bb54764b1 SHA-1: 0bae79e24c512b3989dfd6e32dc92da01093d390 SHA-256: e2befba891b81fb9ce4ba3cb307355aca7f9a03c2438b634dac79a73c0986d50
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs are embedded, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure itself does not contain readable content, reinforcing the interpretation that its primary purpose is to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 http://armanetti.com/images/1174477559.pdf
    • http://anvlaw.com/userfiles/file/83523391420.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff9741505---12001762434.pdf
    • http://china-zzld.com/uploadfile/file///2021052812044430.pdf
    • https://lamthong-marchph.com/piceditor/file/fezifudozaridiruv.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/hd324iahitr3fkqf210vmu6hre/26585974336.pdf
    • http://vasvaripalmuzeum.hu/upload/file/4384557219.pdf
    • http://locnuocvietmy.com/Images_upload/files/99114159080.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608689d009637---83589024240.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22c7c4c7ea---jewixalakiwepalapite.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf31a0501---54766655114.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/3f5eb1213ead3b519bc0afbc7dca95c0/barimiguralakovidoka.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/atth445e2akuif4rafcphvj814/vedanuditutiganaguk.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8d49a19b06ddd52dc2a693165dd71ce8/tipibisofasifijigevime.pdf
    • https://contabil-fiscal.ro/mm/file/72726074129.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/70d010f4b559816f9fbd1353156a78ea/powebubepavusoluku.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/a8769bd0c794e75e1e84a7f3e55b3d31/dufimozoputowudupegepuz.pdf
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc111a8a2e---somaf.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778ebdf3169---9447064449.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f69694f9d4---62684684441.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608020b16e65e---jexavapoxufulexopebafexan.pdf
    • http://thaiboxes.com/piceditor/file/61525818150.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=toi+et+moi+meaning+in+english
    • 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_off0000cd77.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD77 16792 bytes
font_01_sfnt_off0000e58e.bin
9e63f3b79ce808c27b3840e3979e4346c3473b8cd165ecb6854a316926e0f176
pdf-font-stream PDF embedded font (sfnt) at offset 0xE58E 10420 bytes
font_02_sfnt_off0000fcf4.bin
cdae41cd4afa3a265878e67d4c20d446c668057111b06bb05de397669d99152e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF4 18256 bytes