Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0e51853ada9865c…

MALICIOUS

PDF

100.7 KB Created: 2021-08-21 02:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c05c06a5d04b084be0a1505ea1b4c90f SHA-1: 6801d82be5d5300a128090ace2b9b88994932c2d SHA-256: d0e51853ada9865c38b9aa629fe7e716c9bc880d489a596358b5289fc85e6458
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm strategy. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://sewakendragroup.com/userfiles/file/71166842684.pdf In PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b07dbcd2bcb---jakusijuvegufov.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090912e0a044---53826993349.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/97783481091.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/jaduvelubizixiwegarerowik.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ca8522c9dd6e8164d4e18eb5a805f19/ligekazedawe.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/bebix.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/mageru.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aac066da10b---23357433627.pdfIn PDF document text
    • http://artospace.com/pics/file/61010150970.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a748da3928c---63994277172.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105080835151957.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ace38b87b1a---15001118437.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/913deaa91e60b7cb6ecfea7a6dcfee6e/86164026468.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/48794444219.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607419cff29b3---ledinijodixagariben.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/8581ad9320b4315dc5b78a612b3d2442/71216441091.pdfIn PDF document text
    • https://actsonics.com/uploads//files/202108101741011370.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/36436481116.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/lonor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=alphabet+fran%C3%A7ais+en+hebreuxPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E4 19344 bytes
SHA-256: 24f3cdc4724710a74ec95a1b4c7dd07544e5b6e33dfecd086cce2697a9b1af0f
font_02_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 22724 bytes
SHA-256: 8c13b4d00737da28bf980c515673edb770b3c53979301fcaa0fa24a33683bb02
font_03_sfnt_off0001698d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1698D 10856 bytes
SHA-256: 78740a2f360d67599a9d6789c1e4955d679b8551428ce39fdb3de440e55fc9e6

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