Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16b67b573be7418…

MALICIOUS

PDF

72.5 KB Created: 2021-09-27 00:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 923ebd0589e1bba74f41ab2f58ff51c4 SHA-1: 3fe3bbc5f3df032cf88e5dfc321cfc6bbb331be2 SHA-256: e16b67b573be7418bc69628664271494fa0fba2cd2ecca8bed1a820d5a8cd6c6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised WordPress upload storage. The embedded JavaScript likely facilitates the redirection or execution of malicious content, while the link farm aims to obscure the final destination. The presence of multiple URLs, some hosted on disposable domains, suggests an attempt to evade detection and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://gospel-streams.com/asset/ckfinder/userfiles/files/24874575254.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///telupa.pdfIn PDF document text
    • https://bisleri.genefied.co/ckfinder/userfiles/files/refakuwefibitudokonaj.pdfIn PDF document text
    • https://yogaspotny.com/userfiles/file/jonazetisetusatifos.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/dipaxadagebinewojider.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/ripidaridijiridewugavafo.pdfIn PDF document text
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/vefivamudisaji.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2784099b6---77144161166.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/fonofe.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/1482259669.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f829d2d09---nekibapovirowevenadobuxo.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/42699419717.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/20635038358.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/19647596025.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa07de32c2---vuxajepukaxidodege.pdfIn PDF document text
    • https://tpk-m.ru/files/file/zakuw.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/702577856.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/gi1alictph9t6rp0j6m8v98dpn/guwofaraxolexunoxojodamu.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/nimupirolirinulapuv.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/08/file/39519089254.pdfIn PDF document text
    • https://www.barefoothoa.com/webroot/js/ckfinder/userfiles/files/zaziz.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/94552885300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=wav+to+mp3+converter+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_off0000b609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB609 17836 bytes
SHA-256: c1098e70643a89d7473102bebf41ab51a4f40e4a42f540f30efa4a0a8ca756a0
font_01_sfnt_off0000e38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38E 10692 bytes
SHA-256: 4b76bb81b4733ff1ad5c0bcd6049a4da0745507183166dc2110ba50297761895
font_02_sfnt_off0000fc1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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