Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dd4026ad7a4da3…

MALICIOUS

PDF

84.4 KB Created: 2021-09-08 10:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca6b2448bb1135b6021ea73ed739f471 SHA-1: 3fc60ee86b7e475fce878c7ceb0ff31ad83c91f8 SHA-256: 56dd4026ad7a4da3ce4a435c4f315a013aef8efe5b63be298ab41e2d502b3db7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient evidence of a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=ordering+fractions+from+smallest+to+largest+worksheets PDF link annotation
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/crv4s1ok12qdcqi9mmbksusoi4/49326228630.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/sefigorotixuguwimurobel.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a285014ad8a---79812560375.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/nuimraq6tbutut93u92jjg7cl4/52834413324.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/24694099072.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/35295204655.pdfIn PDF document text
    • http://billsky.ee/files/file/71441632131.pdfIn PDF document text
    • https://seerupit.dk/assens/file/kalevubikusedenegeve.pdfIn PDF document text
    • http://kag.fr/userfiles/file/74365974758.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/n18dlc8odo6qmd0vsmr4s6gt4d/kixomigozezipumidatuvino.pdfIn PDF document text
    • http://skoleniridicu-online.eu/ckfinder/userfiles/files/wirefodelon.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/suvaxisef.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/dupegixegozube.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/2568439231.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/fc361c29c0c995674fed1f095f2a8e30/52788991686.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16088b7a39ef71---mojarilalo.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/bexoxosegudenijekul.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/81563d6d84c8b96f1f4c84f332653f25/15073398197.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c16d5e86d---32954130691.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/bijapupaxewineniruv.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c89e269995---40244231281.pdfIn PDF document text
    • http://mayjack.com/upload/files/parapimomape.pdfIn 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://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_off0000df0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0B 11128 bytes
SHA-256: 9d2de948e67137671d3ac46d8c46cc42132489887e8f6ecfe2f49da9a25f5792
font_01_sfnt_off0000f8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AC 18668 bytes
SHA-256: bfd34fd6ed9da1011a55ed007ec877e67db4439c7744c95e4077ea50c18dc700
font_02_sfnt_off000129bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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