Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb6c42d62189c66b…

MALICIOUS

PDF

91.4 KB Created: 2021-07-23 02:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 65cac1799aba7f501e0bd7fe9dcfd14c SHA-1: 1d5ca18fba8650a83b8544b3da0e1678eb35a255 SHA-256: fb6c42d62189c66b063934e9036137e67eac38dc798002f5cd05614debac6659
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, including ClamAV and an ML classifier, indicating malicious intent. It contains numerous links to compromised websites, suggesting it is used to redirect users to malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081e0cc3ed47---13208189892.pdf In PDF document text
    • https://oliogalanis.com/file/44713803718.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd17d84fd3---zukasu.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/rawojevisuxufilazaguwo.pdfIn PDF document text
    • http://sam-global.ch/files/file/lowalow.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/bc25aa9fb6b0735c94f02d29642d5eda/63723824095.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5cf98e5baf1265e315f7f392116bfd4d/zisut.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/nixip.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/86288004045.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/71286805032.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5261585b09249f4d160f437613a42d55/79769213553.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/zemulurotuvajemag.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/440286d0af8ae814e13b70bdbd09a55b/tolotuwetujazonejujep.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/856dbc0fae158dd7c33188e31747c720/xoxivigaxu.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/bibitowazaj.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077785655af4---42491430619.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/masaseziwinedope.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090a1b3c57a2---29851920689.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d642948ff---63042256224.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d19c55591d---delajobub.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35092cb4d4---tifunakafut.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccff1da815---jebeno.pdfIn PDF document text
    • https://tavio.ru/files/file/39229379743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=asking+for+permission+exercisesPDF 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_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 17024 bytes
SHA-256: 9927c8c23bd46a27a6b3d99c3737f5c29ccfdcf160ae5101ecce51c3425df1dd
font_02_sfnt_off0001473c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1473C 10692 bytes
SHA-256: bc7ca39ad84793a8dd2816cb854d55fc7f071de82bb084b0463c078813825ecf