Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b46320fd3e0e656…

MALICIOUS

PDF

75.9 KB Created: 2021-09-20 16:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 50fd3102fdc97927bfa761afeab50eed SHA-1: feab0364220c9dab04f6430cafdb0dee8e8f3f20 SHA-256: 8b46320fd3e0e6561e7b5667e6914d3241f53065d4ed35335cdbe75cf07c53c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=case+in+point+marc+cosentino+10th+edition+pdf PDF link annotation
    • https://varbackaforskola.se/ckfinder/userfiles/files/80623978562.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/delibigokopesuvigexu.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/gawedusifemukavuvuv.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/kavatosije.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/75693802005.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139993d7db12---bevaw.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/vapopusaxonix.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/e6e6906159f0db76478d3f4a20caf38e/widixusanobozumibogul.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0d0c1919f---76842784608.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/rumubuvinew.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/zufifuken.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/65371073960.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/2083351729.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/gomadudamewije.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/wogonube.pdfIn PDF document text
    • http://thanhcongtechtra.com/upload/files/39904605058.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/givexaraginow.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/11072201101.pdfIn PDF document text
    • http://ngoinvest.com/uploads/ckfinder/files/nozuwavatanudebagifemof.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/2564757133.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/xasov.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/75638169126.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/60507094596.pdfIn PDF document text
    • 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_off0000c18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 11044 bytes
SHA-256: 335db3384a0b88c541a9c73306427c156e0ebdb5b9158b16d5e8e420b852cad3
font_02_sfnt_off0000f326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF326 18208 bytes
SHA-256: 0d7237747d6d5c4dadde549ab6b2d7addae277990876e6cbac36a8d8204ac531