Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e938ada3eeb98b…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 05:23:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55abc8fe11a500ea37fb93c6651b8e55 SHA-1: 3a006429e88d5d0eb8956e3650c8231d54469577 SHA-256: e8e938ada3eeb98bcc499e31ecac59221c48ce9b2defd8f5297fa28931c8d40f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm on potentially disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.cerathai.com/image/upload/File/gatajudapo.pdf In PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16258827988125.pdfIn PDF document text
    • http://roocenter.ru/upload/file/nisiwavuwenozisivub.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/83310481988.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f586bcf8dc1a04e3a474d4316b9af5b5/liwajitirapok.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/nuzulowevujibigopasalixaj.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/xugevonovoxido.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b3428cfc4fdd5f3a5e45bc5fef9e3fa1/wetedidigutid.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/3481358000.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/a107292093feeafc7eba9be1a8a8fef6/zojinupurorujijoloripu.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/cc4c879927d43b16fdc188e9790954f1/7459051244.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/9c373135df55b0224553d59f382bbe0f/biwatefekimabovemiwon.pdfIn PDF document text
    • http://195exim.com/datas/files/21254300733.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/dozozawabupapa.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f84f45c7e4229a16ec31deea218aebb3/votagisozikikinivem.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/2b662997a0e356b33fb028528ed457d0/49409089033.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6a7e99660---59429871027.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5ca98e1d9a51765100508a354b5008d2/5363727497.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/23331390588.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/49215894038.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/5d5bggbdrtfd8km16ern7m6dd6/wiverapakejaruxepesire.pdfIn PDF document text
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/58770828476.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc07bd750---milefexutenobezujomox.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ggsv76d6v5b5d63v55ige8q876/98697475535.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=compressore+fiac+50+litri+manualePDF 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 18288 bytes
SHA-256: 4555332a869dc7c57037b0ff0815d725b0eddc67709f9103d3d91e0f09b7e3a2
font_01_sfnt_off00010a2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 11028 bytes
SHA-256: 1e99a44326911be3ee3258a90c3d6a8227089f5b8ef9d12de99e5185cc4bfd2c
font_02_sfnt_off000123e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1