Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe9eabe7214e94b…

MALICIOUS

PDF

105.9 KB Created: 2021-09-08 22:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e9be101e1b0ec8444152c6655a9d6d55 SHA-1: ef69c5d7a4badc15d6b6a41e1813f1d87fc1397a SHA-256: cfe9eabe7214e94b266c4c9195f761a811921035b8c8942982fcd072ae8a6c9f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting it's part of a link farm designed to distribute further malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://ghnservizi.com/file/rutajoza.pdf In PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/6248f7af3a8e61bca1793172c93f10cd/ritesosadaxa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/313c7d9e650f09a55dfb2892552ca06a/sosutimetijajubo.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613807363046c---gebuxavafesosufuvep.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/litiwilola.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/seguk.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/zelunefevutubur.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4098adc7---tapuxabijuwojozaj.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/5462887566a9a6f8024d23397f256ca0/37531327333.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/jatoloromixedi.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/jopipupulati.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/21819183521.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/11153668077.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/nukegajis.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/tazememazudotosilodiseji.pdfIn PDF document text
    • http://www.pilartangguh.com/file/zemebumakoluparazubisika.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/24321297070.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/89704502421.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/finikefosefaru.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/reridopevimufijunuwowi.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/fudevisosazetiwa.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/74629326441.pdfIn PDF document text
    • http://nujhimachal.in/img/uploads/files/91117450401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=zack+snyder%27s+justice+league+2021+full+movie+download+1080pPDF 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_off00012fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC6 19920 bytes
SHA-256: ef9cd37fd02ceb297ec784fe73370b59eb183fe993a2ddb51ea24acec858f78c
font_01_sfnt_off0001641a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1641A 12048 bytes
SHA-256: 68c894d62d8bba324d8260a85f5c0b4d5c53f0a4c6c5f0eff34cb9e478f8e94f
font_02_sfnt_off00018132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18132 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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