Malicious PDF — malware analysis report

Static analysis result for SHA-256 a454883f3ba8d9a6…

MALICIOUS

PDF

84.5 KB Created: 2021-07-09 03:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7b0e6332996fa771e078d3c8a92d1a2 SHA-1: 3b2b10cde5d18418866a35e5fda43567e4dc16ed SHA-256: a454883f3ba8d9a677e73b3c52ede1f806293d24222d08488fa91379d2646967
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://barnesfamilyre-union.com/clients/52050/File/55982135776.pdf In PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/30690295409.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/janonezimudukiwuzuku.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/14289867498.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/11940720646.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/73250677979.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/30919534403.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/efdb09cfc4dd5de391cf15f1c9d41568/28024274039.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/c789218f5191634c869067f3d73ae10a/wizinupavapewid.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ee35bb007---25690507245.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/35731198286.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cd29afe7a---metupezajovawemimuv.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/72pk6qg7l9rjsf98uc59jcaq2c/wunilibemuleworukun.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/7682243418.pdfIn PDF document text
    • http://teknis.it/userfiles/files/55580001332.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/297f643f5c62d7a49ae5b7c6d39e4208/59796104668.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/sazibor.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65189480222.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160ce468cda056---gudabelewaroz.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afcfd6367ad---gejunagalopi.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/evt0ggl3422cc7de7hurv5eo9f/35583548546.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d17d0c5acb---21355109532.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/53546535437.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a097b8e6f18---10318229346.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607384b25b32d---pidenijev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=civil+engineering+drawing+text+book+pdfPDF 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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 16196 bytes
SHA-256: 37b62342c61e3e416e60a6eb839ae902be41c935530efe74cb6d749595ac5aef
font_01_sfnt_off00011324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3B 11024 bytes
SHA-256: dbaf9b4fb04fe345c13d3b1d74069fa062a15664881904902493d2cd4d7e189d