Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca21bf5ce835724…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 21:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bbbd95a7301b5dde3f82dd7e695aef6e SHA-1: cd6b83604b9e7c1db074333a07003012b8487112 SHA-256: 4ca21bf5ce835724896b3cf0ec9412b04039ed8fbaa80f359d21f916a2d07236
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, several of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://clinical-pain.com/pds/userfiles/files/65053993293.pdf In PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161379f312b08f---27274151123.pdfIn PDF document text
    • http://cbstav.cz/file/33674598710.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/1334926249.pdfIn PDF document text
    • https://2winit.com/Files/files/13809491832.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/42579207363.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/jerifa.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/gekuxifilimemetofege.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/taterokov.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/28603023497.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210904015428.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613956d343936---junigiruwetawuvufuwawe.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/38571324244.pdfIn PDF document text
    • http://cochemical.com/upload/files/80930427139.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/eede03a470c185fcd0695809625f353b/wapipi.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/webuvi.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/notupoxuvepuxowagokapuwa.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e609c3d0---75284806819.pdfIn PDF document text
    • http://immopolignano.lu/images/44768955445.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/65073200348.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/55281491205.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/5417771432.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/28921447766.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/44387643402.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/nasevifinovewopug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=best+video+maker+software+for+androidPDF 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_off0000d4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFF 17496 bytes
SHA-256: 3494db915509f2c36e3997954c12b3d31cb7283cbad2fe05b1de42ca2bf6ac1a
font_02_sfnt_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10764 bytes
SHA-256: 241a168f306fae7e51f9311f90e97353f65dda55a448d01ad0c94b2960e7f641

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