Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a18709865cb949b…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 04:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f6511122676e0626e2c1a0e92ba57b0 SHA-1: 49a1934ff0e963cda97e438e6c1f93b594628e59 SHA-256: 6a18709865cb949b797b19e0a4102d81abc92a66617094edb6b409c4da68f2c4
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and URL distribution suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://termokingbt.com/ckfinder/userfiles/files/xolexepizazufu.pdf In PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/tiganawatisomoxaw.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/0eeb67aed9671c85acecfaeeffd634bf/9295884372.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/jrdjpbru5kmq9a22gfv4rpj9p7/25629128289.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/41689539239.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/magazudesesap.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/nebabenok.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/2538476975.pdfIn PDF document text
    • http://lamgi.pl/ckfinder/userfiles/files/7185027470.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/biranufefi.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160706f5554699---23769012463.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/fovupugipama.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5f68b8d8c---lozekuvelosowisu.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/nafosozabaveb.pdfIn PDF document text
    • http://agrion.org/upload/fichier/vofebudarifitabo.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/miwupebe.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160737cf20d7de---pedefatijozejis.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753b1aa00f9---risuzekadibumefok.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/kopixonawawuligibo.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826f4c32a45---51751907835.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/ed7a62ba3b10358f1971f569f781e0b7/sulafebiwopaxegaxepafe.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/8ac87a91bf83438185541a7ac3c762e2/34368894817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=pradhan+mantri+kisan+mandhan+yojana+pdfPDF 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_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 10924 bytes
SHA-256: 5bd024e708414afa7326f04e2acd9aba930368641a0c2f14de447a9fdb5ddcaf
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 17800 bytes
SHA-256: 9345fac93b87634bcfde868248caf4f77f70d80dc65aadf51628f8d16a82bda0
font_02_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1