Malicious PDF — malware analysis report

Static analysis result for SHA-256 78284fcf22925e63…

MALICIOUS

PDF

68.1 KB Created: 2021-09-24 14:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b81fa74ffd07ab92014c2cba68f36998 SHA-1: 2d9464ba100e4d13f9966c6fb721fddc241704d3 SHA-256: 78284fcf22925e638136579d091c65b49854eaedb1468aa4dda4b2669a53b655
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and numerous external links suggest the document is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://projetovm.com/uploads/files/jajujaropavozexoveseja.pdf In PDF document text
    • https://crbz.ru/userfiles/file/nuvufuki.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/60245793074.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/xifagixofamimufaxav.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/38921234078.pdfIn PDF document text
    • https://agatanorek.com/files/file/52832089959.pdfIn PDF document text
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/pobonidesilekepuburomu.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62493867397.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/77664470309.pdfIn PDF document text
    • http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/50084256730.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/37515281986.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/15310484794.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/1316ed0dfacdcd17964ccd7f8aefbd74/zawetoponuzexiwe.pdfIn PDF document text
    • http://talleresjpg.es/img/file/niziwoberukolajisexexo.pdfIn PDF document text
    • https://magatek.com/documents/file/sugazenemategalobed.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/4186a4314037e6aca36fb746524f1fb8/80816010694.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/54332903234.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/fevedawigujajuserorugi.pdfIn PDF document text
    • http://masonhn.com/d/files/92705254173.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/likexetozizut.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed93cddb96---sidedadamupezom.pdfIn PDF document text
    • https://dichvumoinoi.com/ckfinder/userfiles/files/kuligipokagigawo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=3+player+football+gamesPDF 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_off0000adb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADB1 10836 bytes
SHA-256: 90bedbe0f2993faa1516534a7cba8a0650dd07fbc89b046d4ad3e3884849e6c4
font_01_sfnt_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA6 14532 bytes
SHA-256: b58635d48f44ed6b215536f250e8c8429946fc8f5270feca2511d4f7722d8f35