Malicious PDF — malware analysis report

Static analysis result for SHA-256 969df8166c6013d3…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 20:34:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5a7c287a7977bec259dd536919d0c06c SHA-1: 93df64d3a3a6340866921e902619381b0c69c20d SHA-256: 969df8166c6013d33c8f0be82b14e7fd53656cdbe70841275c9f2d2fc1059b03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sarvodayasamaj.uk/upload/files/mamidewumodazemele.pdf In PDF document text
    • http://dfanchem.com/upload/files/madutuwegir.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/50444186906.pdfIn PDF document text
    • https://ku4ysk-9lgp4y.com/contents/files/wugabusirexikozenazuzuja.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/3949796820.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/18392765589.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/midalobuwovulefefene.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/kisalamej.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145789c6bc6c---zenaralavamoriwutagipimuj.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/28241872494.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d61d32752---fonokase.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/464cc13729f6de480a8361667a3bcea0/41915317572.pdfIn PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/43213171333.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/sorevo.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/5589089901.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/298854897.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/likuvipozexidojase.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/volutoje.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/47086397582.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/35789e5f30f71f4213d972fb1e75791a/kixepuzuk.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/72184923430.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/87469631174.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+minecraft+pe+versiPDF 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_off0000b0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F1 10932 bytes
SHA-256: 2f2d15a2cee1a72510d1d222c0000c1ace9a90438b1b35b87ae42dfdba843391
font_01_sfnt_off0000ca41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA41 14556 bytes
SHA-256: 33fd0c4458079bdd562d24ddf4a664d499a5635451008948686095148132420a
font_02_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1