Malicious PDF — malware analysis report

Static analysis result for SHA-256 506678a087066d50…

MALICIOUS

PDF

86.1 KB Created: 2021-06-25 23:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bafafa593bc2d3a1c27378762b2118ce SHA-1: ea461caa907db2c5ba37f3865ccdaec4049c7902 SHA-256: 506678a087066d508f07adff9bf909d33497553b6376775a93a90c858f232e8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, 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 structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://oniceh.ru/uplcv?utm_term=printable+house+shapes PDF link annotation
    • http://guides2alpes.org/uploads/file/83535970984.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780064496ee---mebaxifozabefeluxebuxivot.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/522204bf7fe6fca1b33fde9ed865a364/gibizatisuwonagibofuvilop.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/vukutumunefe.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/41517951865.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83064a599---dizedodusijewuboxuw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2666e9085---31825940107.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/xomifolet.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6590c389e---52763302603.pdfIn PDF document text
    • http://bagiez.de/userfiles/file/37209507621.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xarefugebip.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a87812215---36495112181.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/hq2pt57jrdnfe7ueo6m9flobq6/judoxebitusi.pdfIn PDF document text
    • https://baongochoa.com/upload/file/zoxaduworitejav.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/97259572800.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/gfc47hlj56c5irvmp9oeu7ogh0/46819193113.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/8f19c5fa3430c83e01f23a8215b23423/27940376671.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/nobeko.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e4026de73---bavagod.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160702f94188ce---tawurivugofake.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/lulanozuwavoxo.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/90379357642.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/56cda9c10f58940ff76effb2160670d5/58132223539.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 10592 bytes
SHA-256: 49dc2137d0b5f11e05ce14a969dd9ca56a4846976fd96c131ec7b050ee96c51a
font_01_sfnt_off00010517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 17780 bytes
SHA-256: 22b092d41537d0cf13e2c8da622d8d37d42283f73561914d32d8ff9f632a708e
font_02_sfnt_off00013333.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13333 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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