Malicious PDF — malware analysis report

Static analysis result for SHA-256 e435138516a6f2c3…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 04:44:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 24a88e80e1defa843f9f3f8a8ad5a214 SHA-1: 78dcd27b3e8be71f9984603b41926aa705f7fd2c SHA-256: e435138516a6f2c387fb2df92c888641966b1ac1ceac2c3d45addc8fdc9a313e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing a link farm hosted on compromised WordPress sites and other disposable domains. The presence of a 'download button' heuristic and the ML classifier's high confidence score indicate a malicious intent to trick users into downloading further malicious content. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or redirector for malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=pokemon+gba+games+download+for+pc PDF link annotation
    • http://silarperu.com/UserFiles/file/wulezagegu.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gunajuxujigaxogexazobo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/wexapavo.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/51043024744.pdfIn PDF document text
    • https://ladymamashop.com/uploads/files/202109100900447344.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/zagijekemum.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/turonabidudomibaro.pdfIn PDF document text
    • http://only-svet.ru/upload/files/30145262320.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/12758808202.pdfIn PDF document text
    • http://makaroma.fr/upload/file/dikefijiv.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/xonanafo.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/00e3c2f8c1ca3ab5746b825af26eac1c/famugejitimokepeludi.pdfIn PDF document text
    • http://grotech.in/userfiles/file/kevezevunomivawalujel.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/68251705202.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202109160357306231.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/96178240489.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161309649316ab---vumemufulofexibopiritosa.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wawejapuguser.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/xikaxoxelakunam.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/lopagagoninixaz.pdfIn PDF document text
    • http://meta-min.com/files/90501586455.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcce41cbb8---37990277281.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_off0000d5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 11092 bytes
SHA-256: 5b4da9508eb3a9dae7212e1c60e9a3f27798ddf3602abbf65ad0bb1876a421ac
font_02_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 18676 bytes
SHA-256: ea27aded56a862fef2c0b55a92705a4cc9bacab99a902ff28478a8035c9cd2f5

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