Malicious PDF — malware analysis report

Static analysis result for SHA-256 3654f5f5767d34c4…

MALICIOUS

PDF

73.6 KB Created: 2021-08-31 09:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 81e4c57604eb056d35c4d0152d0e8343 SHA-1: defc7df07b734da9e4d1cb1da07fd67269e19360 SHA-256: 3654f5f5767d34c4b74f174aed1a9a4d61ea6c15f23a188259eea7fd8806c87b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://manajrgvaaradhi.com/cms-uploads/files/lewoke.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16094653a03812---6487779393.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/43022191874.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/odecf9uf15um9flndr0s8mg58q/gitapisazono.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/59008897611.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920a39020d4---kapimomutonakejegijujede.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e358e6b87774375d0bff01df3c4cc500/kivutenexixaxadaxajometur.pdfIn PDF document text
    • http://baovevietnam-vnss.com/upload/file/36240478321.pdfIn PDF document text
    • http://guchenes.com/d/files/82282925485.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a978ddebe32---27068426544.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/94939720034.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/vuxomikizinutela.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072014da1365---lopojomasiwesakevoriban.pdfIn PDF document text
    • http://henca.com/files/details/file/44312438.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/90d7ec35b5b559f151950838e424c442/96646827564.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021051912520973499.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/8f13f7b240db9209d4d7e7de2387f116/85981512323.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c1389324112---juzazew.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/27320882552.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/7016122875.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/pelumolifuvifexaxovenuf.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a2e5da170976761c976836a9f952d57f/6397740715.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18934ee487---7187113107.pdfIn PDF document text
    • http://aroma--style.net/files/files/faburunexekitotexejabimiw.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/tibonunoto.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/ce19fd8e4c94f81a958519725889904a/bujego.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=the+meaning+of+elucidatePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98B 17720 bytes
SHA-256: af220c1b81c02f449e4aa6b8c3a00ee4349864941519cacc1b3226f9fed02da8
font_01_sfnt_off0000e760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE760 10716 bytes
SHA-256: a874c113b72f86e5767c614db31eb07c2da90be5bb5b24d47b7aa63773e2e6fb
font_02_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1