Malicious PDF — malware analysis report

Static analysis result for SHA-256 8754e7b26515c93d…

MALICIOUS

PDF

71.7 KB Created: 2021-09-26 05:38:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cf21d9a3aa5b640530c180046e2029c SHA-1: a060973ed047f5d3f2c35e007f0a8968a33a623f SHA-256: 8754e7b26515c93d9024f7fa8800bb04418590cac89f697f2562ef85857e8a3e
176 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to potentially compromised websites or raw IP addresses, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the nature of the embedded links and the PDF structure suggest it's designed to redirect users to malicious content, potentially exploiting vulnerabilities or leading to credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vinacomvietnam.vn/uploads/news_file/19442996409.pdf In PDF document text
    • https://prosaison.fr/userfiles/files/keber.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/51365977525.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/94583049803.pdfIn PDF document text
    • http://urs-certification.com/gais/image/file/rupezufumuwata.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/gulivojowiwu.pdfIn PDF document text
    • https://rais.bg/uploads/file/95810450668.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jaxevuximexogo.pdfPDF link annotation
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613862edcb6cd---31669531423.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346abb13b7b---bakikizulelap.pdfIn PDF document text
    • http://topas.lt/userfiles/file/vitanibixumepapefamaxok.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/jigekipo.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/23024450366.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/31146440630.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/gukojegeviragetajinegepe.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/vonoluge.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/8050173559.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/vogusexefiv.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/25895633228.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149295db53cb---82256855385.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/86813794589.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/ronalemeninufa.pdfIn PDF document text
    • http://chayka-svg.ru/files/21745645050.pdfIn PDF document text
    • https://everestart.com/images/stories/file/30267964835.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=free+download+name+ringtone+maker+onlinePDF 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_off0000b4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F4 17376 bytes
SHA-256: 562ccb0cedc8b1b4ba5a6c8e45b9da530acf691cd207e1681ff85cfe165295bf
font_01_sfnt_off0000e158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE158 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96F 10580 bytes
SHA-256: 71cd42e6907aaf3bf86cfe282430f3f796e6e60bb90e2ece570c410c0a0409e0

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