Malicious PDF — malware analysis report

Static analysis result for SHA-256 64151adbf16e7e1c…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 09:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e53975b91edf9a047feae19a3914ee52 SHA-1: 5a7d811317f31042b5e1e5af6539a9567136b095 SHA-256: 64151adbf16e7e1c016c3ae13a9c4d95895f8d57a2ce3076926723bb5235a15b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, a common technique for executing malicious code or redirecting users. The numerous extracted URLs, many pointing to compromised CMS uploads or disposable hosting, form a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://fsoa.cn/userfiles/file/taluneva.pdf In PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/5hf53jam6apn0e93a6kh1bq2ad/47981066438.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1527d8d34e---zudirizemepu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b01a92dd10---34865861383.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/81641920532.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/tovavedelawoderiwut.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/88337647802.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610a5d3a78064---dunomulafakituv.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160975f2a8e1d6---tebixinomuga.pdfIn PDF document text
    • https://lecachet.fr/docs/files/29663724422.pdfIn PDF document text
    • https://hirurgija.me//files/wonexomipodagokakowudirib.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160928ce78a287---23330406022.pdfIn PDF document text
    • http://origo.ws/userfiles/file/doloxezir.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-02-12-02-34-3IcJ9mQn.pdfIn PDF document text
    • http://tiga.co.th/ckfinder/userfiles/files/sekekasesepijatunapiwogax.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3dfcbed00---98915073327.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7ffc36cf---nolijinizigufuwatazire.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/sifojotiropefidajaje.pdfIn PDF document text
    • http://mobilenmr.com/files/files/71093821399.pdfIn PDF document text
    • https://spandoekland.nl/userfiles/file/51927517686.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/fc7778bd991a97f93d0b6cafd7070b29/62378583429.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/73b0dd14431ebb0fc362dfed9baa8d8a/bikuxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=acca+f5+technical+articles+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_off0000e3f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F9 10712 bytes
SHA-256: 3529955307e4ee14524ab9215f79786feb0f68b08fe7ffb42aeb09dec71ece08
font_01_sfnt_off0000fc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 18304 bytes
SHA-256: 39a19da8ae7b84001f30c63767a294c03239de4b543b32244eaf9735432dd57d
font_02_sfnt_off00012c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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