Malicious PDF — malware analysis report

Static analysis result for SHA-256 594e1372f6e957c5…

MALICIOUS

PDF

84.9 KB Created: 2021-07-08 03:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b42ca8a1906adf563f2d28e97ef2ca21 SHA-1: 5020344eacec2f88fb161edead0ecf14ab13ef1a SHA-256: 594e1372f6e957c568b677c194cc59a35b6d34f78f1de05d9e0ed3d7d2008c5f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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 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://philabc.ru/uplcv?utm_term=subluxation+of+mcp+joint PDF link annotation
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071695b9d397---83115768677.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/xufadibimukomuk.pdfIn PDF document text
    • https://synersys.fr/contenu/file/49578819769.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/40edf636a95d05fd6fe730f1469a78be/jaxegabezit.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2fac6d7227c8c3e07fe9cf9e84eff5b6/kimobufodoxodosomepudop.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ce5e0bef8---34497708777.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/ho11nogj9rb4uh0udp31r5rn05/53449305054.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/c8b9de8fb4346f32c6d9cfb9f2cd390b/39629822805.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/c65cdad23fb4c6e9855cf1dce8a92657/18130644767.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/dbcdfae5e7f84f8d714541e764b845ff/85769495429.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2d9329c1c41e0dd415007f019a173983/15661445219.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0c82b8b96999cc250393565a1d7b6c62/gegizipugi.pdfIn PDF document text
    • https://fultoys.com/userfiles/rutoxulefenorot.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab4ec21675---36203581659.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4871baf82---nepexifabobibidilimaf.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/331bdf4f6a06689155e19a9eb95ca054/lojot.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae35379d9f8---30407922273.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/nipevebetefawagirekimovaf.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfde0b7174---pufezaxiju.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/xudepebovodemiva.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/97f5f7fe15cbaf5a3627b6b5474159d4/67144052601.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/genawijogamebiwamilipo.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb6178b0dc---bezulebino.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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 10788 bytes
SHA-256: 5d26d2692559305512018957b033e562b0ca84015cd08c0e58777bda3d9288d6
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 17500 bytes
SHA-256: d2b9cdbfdfb08289e899345c78e599f064db96840d108e9c84061beb51c6cca1
font_02_sfnt_off00012e54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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