Malicious PDF — malware analysis report

Static analysis result for SHA-256 31469903a451a27f…

MALICIOUS

PDF

95.0 KB Created: 2021-08-07 13:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4dcf3940ec6c569956714ba07e5e4caa SHA-1: e9d22d0173a867867e19b2ecd911efbe2d59022e SHA-256: 31469903a451a27fb085edfcb1ca899e124d3fc187af840f587da8d9b3024999
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress sites, indicating a phishing or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to exploit vulnerabilities or deliver further malware. The presence of numerous external URIs and compromised CMS upload links points to a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://m3hotels.com/userfiles/file/xajowudanogeveb.pdf In PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jpbtv6maahslvu5kcp1p2kmco7/nazivapelapuzag.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160f48c2d072bd---55510062694.pdfIn PDF document text
    • http://lowndes85.com/clients/d/d3/d39312ffd46aa2fbcc4e4de04d96a17f/File/67008798421.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/43caff5fea876158fb1bc5f31be428e0/difefuzat.pdfIn PDF document text
    • https://migger.dk/userimages/file/64034703517.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/ua7ecn4l4f67und40scvk61i7i/kugerifugevavupek.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c899075c09a3919f1e1f3cd104c8a12d/19164392182.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/15517825191.pdfIn PDF document text
    • http://geoman.cz/data/file/wixumuvotonozufifor.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/69891977894.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/7hs5crko5jfl6tcac4f5thpqi1/widuzoso.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/sijet.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16079844074d0d---sugowizekobavu.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/688834ddd0ca6255d33f7827f05d3b21/67959076202.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/72491588036.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3eea6e640---70236831186.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba85dd8c34---debazizuvobomusifusowe.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/tibuvumusewelatawuvofex.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/moa8gpvvko70li60j0i7d9ars6/22760381427.pdfIn PDF document text
    • https://seerupit.dk/assens/file/89182581149.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210623_134802.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/78620432132.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e6535ff3c10d0ccb35a0485d22db9199/bufupuwisobesur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+measure+for+topshop+jeansPDF 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_off00010c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C46 10792 bytes
SHA-256: 5618105ded79367eef08b466bd7479325b5af19ab0cee32570ee728dae327f4e
font_01_sfnt_off000124fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FB 18292 bytes
SHA-256: f944cdd8e30f2a81a53a96676c154fe856e65134c4d98a606bcdc0c5198c0acf
font_02_sfnt_off0001553b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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