Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27e4d1e3dffa0d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-07 13:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7f9eaff9fbe4058a269ac7094b7007bb SHA-1: aaf9886e35f25cba9b390abe0e2297562e1283df SHA-256: 8e27e4d1e3dffa0d3424c87872217920ce4dcafed93133baf49c7b5444950f80
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting domains, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://wastran.ru/uplcv?utm_term=superposition+theorem+calculations+pdf PDF link annotation
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/86669458233.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ee47383842e---bimidozesimawabunil.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070c87888858---25523809732.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7c0220264---35355585803.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a024f6cb4fc---11873533637.pdfIn PDF document text
    • http://artospace.com/pics/file/jijebagapomugi.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/91365102856.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/paril.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/a3c00cf59007bc2b4560aab4d6406265/23291018975.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bacfca733c3---42334509479.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/19908924483.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///90396105728.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b79cc58297---watigajataxubawemakebofor.pdfIn PDF document text
    • http://illinoislivestock.org/userfiles/file/wajonofurenawumesetexivi.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/tezifinobagojofapogot.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210827212610_15lnks.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2440a2834---zobajenivumanigaxexali.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb0de0194---25369765178.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/fubuwigetikopi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/wowojesivozegadigevejusa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/7eb4caa3cf93c2ffe1060267e7b55bb4/56137801652.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/54c50372b3be88248c82cda0229aa9e8/99282452262.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/xumolidoxedojema.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_off0000dde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE6 11060 bytes
SHA-256: eaaf259d069add0c94110bd375e06046428c45ddf398c782fc181683c671682c
font_01_sfnt_off0000f763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF763 18896 bytes
SHA-256: e4cb69b21dba7ddd2ac1932e73e2334edf9e5bf800079fbfd5be7cb197bfa21a
font_02_sfnt_off000127b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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