Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6e1c8fbe9e1ad22…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 02:56:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 38a36f3cbce32a01bb65e977e36af37f SHA-1: ef428a703a1dbe450dd4429f815c843d7ecf61f6 SHA-256: b6e1c8fbe9e1ad22fdab9eba797364e58333819f8ddd21beb02c1e1729c65dcb
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://hometeamcorp.com/images/usr/5517705535.pdf In PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ac60d00b9---pamulok.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/kobonaj.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/osp9jj8b9f9rcfln82f494ilr1/fexataxuwovodenoti.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/b51pmohu7eop1g0pvlqqmvghb6/tipomuvosuvamomu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad38426fdb3---fifubop.pdfIn PDF document text
    • http://wdnederland.nl/file/jumem.pdfIn PDF document text
    • https://study-abroad-travel.com/ckfinder/userfiles/file/60433635172.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/jelagumuwo.pdfIn PDF document text
    • http://cesnek-vysocina.cz/UserFiles/File/28582941830.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/43922598105.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/58404948228.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/wolerar.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/gutugagefika.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/pipusavu.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16081a4f82d9de---96453663816.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607812a253b1e---ropafaniwamusaruvelinuroz.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/41051343073.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16085087f9d9f7---wajupudezes.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/zapatasilisuxobukaxusupa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/jmh5icuojvgg49v308tdg0lgfl/xufabopijoxew.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/dulivajuzilelujipudaxe.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/75p2fvrkf18c8le6r53ekqncf1/labefej.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/5t1lp4dmag7muke4upmukmfe4m/zuteviliwodofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=sensoriamento+remoto+e+geoprocessamento+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_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 10992 bytes
SHA-256: 978b3511abff9cfcd425e4b6aff0d74c5c918c9eccccfaa5f9ebee3f2bfbb982
font_01_sfnt_off0000ddec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEC 18648 bytes
SHA-256: dde46e5911858e56329601d2be80d496c631269fa821df23d005baa9129c9094
font_02_sfnt_off00010c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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