Malicious PDF — malware analysis report

Static analysis result for SHA-256 15af6af3c6b5fe35…

MALICIOUS

PDF

90.6 KB Created: 2021-07-05 13:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: dc60fa6cd60551fddb4b92fc5f9fd5de SHA-1: 747e84d415cdf44b9b5c0156ca2c5e1cd8f24e56 SHA-256: 15af6af3c6b5fe356cf1b715fc9e9777f0970ce0cdaecf2b9acfa855a5a18d60
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which appear to be hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://chcial.ru/uplcv?utm_term=how+to+enchant+a+stick+in+minecraft+java PDF link annotation
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/f65d53b9fb0278e860d612652d0283ab/25170433279.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1608a95560ec19---gidatarifipeziw.pdfIn PDF document text
    • http://ipublicity.cz/data/file/11990421501.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/32649718437.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718fce4314---mosipizeridodisu.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/kivitozolevebemeguxolapef.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094e2bbe9970---20997124772.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b424138c54d---zejarasimiwalabemub.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a10e7b3732a---17554707816.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c6c2a5866---34077290324.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/e4f6b52f2c88a7a07d031ea70faf5540/damukozejaxiniviwebunoli.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/30172602970.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f9ef4c12e---melofalukabani.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4aa6e712ad60d17851c2fb775c08d3ec/93085454775.pdfIn PDF document text
    • http://musthighschool.mn/ckfinder/userfiles/files/tanenexi.pdfIn PDF document text
    • http://memphiscentral1969.com/clients/865565/File/misomepojewitafufad.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f72a8155---64284859046.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/44181192773.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/81065196437.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/95853764146.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/10215340814.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/pilsq3at5gp4v185eese3ao0no/relowi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7925cb266---28531622570.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/dobabe.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/nevetelixedixegadut.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_off0000f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A7 10920 bytes
SHA-256: 3aa0d7ff90c0f964f63e66b79142aec4141f3d7bb2fbfed97e53e1d892b4dd38
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 18800 bytes
SHA-256: 5ffaa79d61f74f0067cba5b2c2063cc1f7c2e44c6db2b14e4f6d95761d9b0322

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