Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa3bc1c1889fca57…

MALICIOUS

PDF

96.3 KB Created: 2021-06-19 12:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c2899d69d138da62b583c9158849d534 SHA-1: ab4bbca931a5c0844b9a5a8aa40e75684cc00d17 SHA-256: aa3bc1c1889fca57a6a532c7f7e8858aacf82848492a50cbe48205c068498503
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to various websites, some of which are hosted on compromised CMS upload storage, under the guise of providing downloads for popular media like 'Dexter season 1'. The embedded URLs are designed to exploit SEO poisoning tactics to attract unsuspecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=dexter+season+1+free+download+with+subtitles PDF link annotation
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/beb0722d17ca2fc9e931767f7548f0d3/80773364610.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/28f442641691ce66cd257254072a2622/jejizutib.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fabowifikiwo.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/64011234715.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/44719233540.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/59f6fb6350dc3c5812b0a0c3f377868e/33251341942.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/5f3ccb35dce8a57c106e8eaaf550994e/68522639656.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f9b017a8---31279804384.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/8e02e33372827559069c5889cf003cdd/83037590774.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/bexewuxalolixitibudirazid.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ff8657f0865eea3be3224657c4f9b679/kakuv.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/rotosudarovetuwom.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3646b94a6---guvidexoxak.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/21655345423.pdfIn PDF document text
    • https://mariapolis.net/ckfinder/userfiles/files/59231406308.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1bee7363f55ce435461ca2d670a01268/mibabagefevudenikorisoxa.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16086830626a3d---lilufopakupuza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 3644 bytes
SHA-256: 839b6cd8739f96aa2b259e190c7a67d3e07d17a89cc5fd59562c4147430d28bc
font_01_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 5344 bytes
SHA-256: 9d5ea906b7eccdcbcd7ef678209e885fda4bab1d9ec8c5b22361d51c77b6b16f
font_02_sfnt_off0001339c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339C 12228 bytes
SHA-256: 0168f15f3b75f5610f32baac9261d0f03ebf131943cf55769132a00e7e0fc12f
font_03_sfnt_off00015ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE2 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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