Malicious PDF — malware analysis report

Static analysis result for SHA-256 57d9a0368e3c5c83…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 03:09:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 013f978a81a5fb5045fe9d06cf3fec7e SHA-1: b459e56809b63aeb5a155a32c2117ae98c1f8101 SHA-256: 57d9a0368e3c5c830f7b32d83fb0147d9ae43064d5d62dd831dacdfa815dd155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging T1059.007 if JavaScript was used internally to manage redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://garglob.ru/uplcv?utm_term=process+of+mitosis+and+meiosis+pdf PDF link annotation
    • http://www.kowel.com/ckfinder/userfiles/files/1629503883.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/42497fa548f08ac54cd3051f3475f863/pobixujijuxemu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb773e3e2f---2204762944.pdfIn PDF document text
    • https://trade.inter-ural.ru/ckfinder/userfiles/files/44969050570.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1cd45c40a368e3e9dff247821a1238da/10883003479.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/25267083789.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ke2t101jbt25gh06qif8gbpon0/jawese.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/vilalatijibowidit.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/62997635034.pdfIn PDF document text
    • http://hkalc.com/userfiles/87140169542.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7f975b66af6fde8d731e04753f866408/rorotaj.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/64566161284.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/fawodabupu.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/dadegiwumos.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0172caf2918e87e9396ec99f0f6baee/45808491275.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/bixarelejofegijevonona.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b086b05f548---30805353262.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/09888tdidnpbmp52pmval3ub22/21212100845.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0ff0c98---59751827010.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/sawir.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/59927042538.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611dbd082bc0f---jaridem.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/20923541709.pdfIn PDF document text
    • 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_off0000cf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE793 16820 bytes
SHA-256: 447a0a3574c64f3a8dd180e27abfe6aa5b3027f7690046a76d2784caec4c7cf2
font_02_sfnt_off000112f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F4 10736 bytes
SHA-256: 495735d7e01ac1155077326db26034451ef5a7de84837ee3c02b6c460d54bc3e

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