Malicious PDF — malware analysis report

Static analysis result for SHA-256 16557f4be255ba9b…

MALICIOUS

PDF

96.7 KB Created: 2021-07-21 11:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a89df03119441ebc5ae829a2147288c SHA-1: af328bcd1d80bf59a6e18f98e150a8cbadd81c3a SHA-256: 16557f4be255ba9bfca468a73f7f2d0548ff4089384f99903702411b4c990c8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm. Some of these links point to compromised WordPress upload storage, suggesting a potential distribution or hosting mechanism for malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9404

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://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/vuxorefegaxi.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/j8aelr4vbbum6pk3kgmlrntmb4/felatekeredunoze.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/82616152356.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8670f1c9f---85499766467.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5d486e719b7e2992741521d25a44293d/xajibam.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/67577169247.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/9850436661.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/d8f45f2613e934a0a8ce4b39079f72c8/18867575579.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/80448480599.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/30194800110.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076887def09e---popizuxipez.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/t66tpa6746271b73e1415iaoe6/tubukupukikezaza.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vikebesotowobagazizuvup.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16229132083744.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///27786982421.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7911a705ab---91294214648.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d7c4c4945383cfc39d6512034a980333/dupifimiruwa.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7ac63e7ba8---majaxukuzob.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d650c9de---toxafom.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fapoputasoxupurerenek.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/84667135804.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a154e6a8a6c---kawurug.pdfIn PDF document text
    • http://thefarmatarapahoecounty.com/userimages/69957885864.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ec0d8f6d692135f5d06795aebfd37584/sebokepepejo.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/41796904013.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210721131759.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/pegig.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca2ab7a3da---sutulevijivupejegi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cloze+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000135e5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x135E5 21432 bytes
SHA-256: de98f7645b14ed24e4a96862f860098e1632f4253549e168779537889196ceae
font_00_sfnt_off0000e032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE032 10448 bytes
SHA-256: 74d60f3b1f8cddb39587707b689c8ba3011640ea123ea287ead0d24769546f31
font_01_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 19204 bytes
SHA-256: 27cbc3f4297b1f05f9edd0d2b7572e54e33d3f3afcf08809a3e92aba29fb0ebe
font_02_sfnt_off00012966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12966 3092 bytes
SHA-256: 7d7610d7c5d0021d6952bdfc31cf90db332ae7816fb0a458ecebe2f7209da793
font_04_sfnt_off00015a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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