Malicious PDF — malware analysis report

Static analysis result for SHA-256 420e3fc24ce11c48…

MALICIOUS

PDF

85.6 KB Created: 2021-09-08 13:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5dfb0806267dc3879743237f50fdbc3 SHA-1: f71308dc5e057e9f9f9c30ba14393cadd14b23e3 SHA-256: 420e3fc24ce11c48435271895ebf7c5e18068e75b7a94aab65abecaf714a6315
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=complete+defense+to+king+pawn+openings+pdf PDF link annotation
    • https://zoldlepes.hu/userfiles/file/vivibojaw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320093b2b2a---sonedomusaxogo.pdfIn PDF document text
    • http://herve-coiffure.ci/files/tadosifefusujonekozadaja.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161386e5dc0537---vawipoxeminaduloxofobu.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/sosim.pdfIn PDF document text
    • https://citytrafik.nu/images/file/98590346633.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/43198982666.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905050424.pdfIn PDF document text
    • http://hcwan.com/userfiles/file/51831339620.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613453869c582---fukafokanu.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/vugusejesoratavororajul.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/wofevusajudemavobo.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/sovulanumitamelojibib.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/porojonufojawofusatuf.pdfIn PDF document text
    • https://satellietgroep.nl/userfiles/files/wovowasepopufiminapigewa.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/babizufig.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/penagiwusipilimumugefavuw.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/nizijizegonewako.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/24586628831.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/gukudez.pdfIn PDF document text
    • https://quizai.com/uploads/files/noxafudeleboduzubakuba.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/somedofigaganusawugelex.pdfIn PDF document text
    • http://citranco.com/users/files/tajunatiwu.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/97919606464.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_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 16916 bytes
SHA-256: 4e3579800619cc4223503f10da495e029a8a4e2d6a732ae2b71a94ba932f466c
font_01_sfnt_off000116b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B8 10952 bytes
SHA-256: 4307caa869aaca34b9c1260e1c86814c79aeb5e555acf631a78e495530d9eab8
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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