Malicious PDF — malware analysis report

Static analysis result for SHA-256 f342efb54a0a0335…

MALICIOUS

PDF

78.9 KB Created: 2021-09-11 18:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 699048e62fc16619caca4be016b78c81 SHA-1: ee4980066e2b6da8d047c16f5a1cdd5b8a693135 SHA-256: f342efb54a0a0335d38f72b397a3dd4c175416754be71a2f955e4cbef94cbda5
212 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple links to external URLs, some of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a download button lure further supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hinodanang.com/uploads/image/files/25319132440.pdf In PDF document text
    • https://laps.pl/userfiles/file/zapajafapuwunuxuzadamaxi.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/11085151636.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/60386525894.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/200593d5e915feea6611211b1d231186/44520295950.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/72809217328.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/76352267801.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613327296a423---nasozazarosazubuji.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/757838221.pdfIn PDF document text
    • http://tvcsoltau.de/userfiles/file/25617130630.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/gitunorexelujizanas.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/97505651312.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/5178422744.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/uo5jg1rcummanjfjr0bd7h0k22/97427330793.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/jelasi.pdfIn PDF document text
    • http://shesob.com/file/files/vemisolo.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/61490214335.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tutavijim.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/pakorulofixomu.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/1440932327.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/roguturepowexepijaviluziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=pdf+to+excel+software+downloadPDF 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_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 10568 bytes
SHA-256: c483d2024cf3f15a220baba80ae8ff7b0df20bd44a5ae266c8f90181066401d0
font_01_sfnt_off0000e72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72D 18248 bytes
SHA-256: c4aa78227b6136c57a698ae7086a1d5bc0da88db8306b73751a2a154a4b04959
font_02_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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