Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f94ca5b6a9cba1d…

MALICIOUS

PDF

86.0 KB Created: 2021-09-07 12:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c50923037348c787db78e36329e23f31 SHA-1: 022eb0962ec9a4afca486309cb1d8a5ece22e87a SHA-256: 9f94ca5b6a9cba1dd030cca8405cc07f258bcfc385ed90991a5019c2ad87bafe
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farms on potentially compromised CMS uploads points to a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/v353hqspjv0ouamubvgm2c8ulr/rufaruritunovabirote.pdf In PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/j2avngblnhgguh9p9tnr311563/mogofejogifav.pdfIn PDF document text
    • http://z500.si/files/4633329892.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/nowawonatijufilopesuwer.pdfIn PDF document text
    • http://skisun.it/userfiles/files/95351593438.pdfIn PDF document text
    • https://redac.ch/upload/93419835483.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/74296620623.pdfIn PDF document text
    • https://beltamas.by/content/Files/fiwubodiwokowebilolako.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/nagopazosed.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/84236383086.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/2424176597.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aae59b6ec---zekaxorikinubemujebi.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/19102106309.pdfIn PDF document text
    • http://edanieltour.com/FileData/ckfinder/files/20210614_0313DDE524BB6058.pdfIn PDF document text
    • http://kco.su/userfiles/file/zavudozenuvinom.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e2eb3485---95679656875.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/56471624735.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc8b4f2f1---dorovenikirilubixe.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607966b199c0e.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609171e983efe---kevojukiwurosi.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/58677663771.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607279b79eecb---majomol.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/fizinebapikudakelejix.pdfIn PDF document text
    • https://securityguardsupply.net/php/uploads/file/xirememavavesani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=rhetorical+devices+in+political+speeches+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
stream_004_off00011c64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C64 17956 bytes
SHA-256: 22125b5bc06a52a6b55fe83ad5e091c0a85f8b91c56b121d2d510424b762ca29
font_00_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 10828 bytes
SHA-256: fbef22392b811099f8396b888380e4d76d719bf94bf0647a8159e86b8b8a96a9
font_01_sfnt_off00010452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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