Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fe7c4d700909efd…

MALICIOUS

PDF

81.0 KB Created: 2021-09-04 16:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2008d5ced4c6faa8b2f3b272fb7c508c SHA-1: 9787f6142ec211dadb0459858be73d4befe25cd0 SHA-256: 5fe7c4d700909efd0eed6cad902c89073670a432cde435983cc6e6ec8eb18b61
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm on disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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 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.
  • 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 http://szyoujin.com/UploadFile/file/20210829184703964.pdf In PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/26703761293.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1f82c7dbf---kewugimorolesiluvi.pdfIn PDF document text
    • https://limsurempat.com/contents//files/maliduvawubakeludepudis.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/83394248157.pdfIn PDF document text
    • http://tktravel.shop/FileData/ckfinder/files/20210613_476B3AFA1AEF9458.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/xibiwotoxewisupu.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/madet.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/bdb4c05641d74ecea6cea101249f2a92/30471571119.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/kolutixosasowekigefabi.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/af5ddc63db31d2e74ca5ebd35d423648/jowisafagow.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/kavegugixa.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/xufovosaluvuj.pdfIn PDF document text
    • https://cubic.is/userfiles/file/pakufa.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160840764925fb---zobemineb.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/62cd049fda31dd3ee074fc188e1cdfdb/lufatixobusa.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/89943541885.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160decc5cd0785---11790716889.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-8-16/20210816122402457730.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/76809525584.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1967bf33a8---8786336686.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/e0f88fc05121a81f499ca528a4247c19/32678749579.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1628848777.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=gestion+ambiental+iso+14001+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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 10988 bytes
SHA-256: 753bcc924eb82420293f56b72808473b807f09eea888c97324037ded005a8412
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 16440 bytes
SHA-256: 1a7cd3bca20f86564cf93ab3e55db60c5b892b855ed2a13343c59e4bdb0a4209
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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