Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fb4db10d10bbed…

MALICIOUS

PDF

93.2 KB Created: 2021-07-16 09:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5494bd6da48767937104956b2664d4e6 SHA-1: b0391b36c50435d7a777847148b085f247035864 SHA-256: f5fb4db10d10bbed20b23121bc19e99c75527edc24e52b77525d2d937eff69f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it's an advance-fee scam lure. It functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF format often embeds JavaScript for malicious actions, and the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202106161817326361.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c19ac3d99---45893001396.pdf
    • https://fcksa.com/ckfinder/userfiles/files/navutomojubofowemam.pdf
    • https://alnahamgroup.com/userfiles/file/rotum.pdf
    • https://castel.ro/userfiles/file/37306634483.pdf
    • http://cybernet.asia/UserFiles/File/35463918141.pdf
    • https://eprobatdz.com/ckfinder/userfiles/files/jizikos.pdf
    • http://matsonconstruction.net/userfiles/file/24946372350.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6fc35b86---majuzewowafutulemegosu.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160851df0944bc---66237503872.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e0a33d31---gujadomuginis.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6a637f8f7cafb63b70a5c597b99982b5/pejamipavenifavuled.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/a9aafad92728bd19cc9a0848db47525b/wududilubonevudiba.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/b609948c5f93b8c5bfc02b806d4c9377/70972205490.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/b4none45u5vqpjge9p2ru5sa8b/toxagovupanadefezobudelu.pdf
    • https://hostingyuvasi.com/calisma2/files/uploads/25989858031.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b24fabc6901d9ce2b7ba3d41be64c212/duvubemese.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078ea0bc9da9---82526053689.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/8gn5n3jqhrpgq7bjga822rgh9k/niminuwotakufavowidopezu.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sg63te3hu8r1aetf4mk8v0kvi7/61756115255.pdf
    • http://altinay-law.com/images/file/wadutojobabimavademibapu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=146+law+of+property+act+1925
    • 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_off0001091b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 16792 bytes
font_01_sfnt_off00012132.bin
1eae57cb7975c9b0424bdb959d99c253344c1fcca1e2c9c6da06404fe6d57d72
pdf-font-stream PDF embedded font (sfnt) at offset 0x12132 10932 bytes
font_02_sfnt_off00013adb.bin
3b6eda9870800175ca4c34f2af207608393ef1768f9c6bb78477bf38d9d25764
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADB 17088 bytes