Malicious PDF — malware analysis report

Static analysis result for SHA-256 284f787060c02bba…

MALICIOUS

PDF

83.1 KB Created: 2021-09-09 02:49:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: b4905007429b1f6f9bb632dd5293fd19 SHA-1: f8f6976bb8f367b600b8093f9a701763398ce5fc SHA-256: 284f787060c02bba0926e4da662b8d6a7943d02bc688178e45d8bb8420b15aaa
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing SEO-related terms. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the structure and embedded URLs suggest a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161393681c34fb---bemezexikezo.pdf In PDF document text
    • http://goldenagegroup.vip/userfiles/file/80510380713.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/84930187271.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/gumariro.pdfIn PDF document text
    • http://sinners-party.de/media/file/59866115558.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/24051121818.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec0cea170---26658180288.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/27934683763.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/kupivogojepikipizofo.pdfIn PDF document text
    • http://livestocktool.com/d/files/18261559008.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/29122948295.pdfIn PDF document text
    • http://managhantasala.net/mailuserfiles/file/rawadogabafosibizisala.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/2669121490.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/95941279922.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/lerakaxawerijitixufakisu.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/60248914184.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161358f9930996---31780091020.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/zidiloselevurub.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/83621978530.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/57815882489.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/lusap.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/kovarewenigugukimivifegul.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/tizotegakipido.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/24520261651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=windows+7+iso+file+for+virtualboxPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fecbbd2c3---texawo.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_off0000e055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE055 17624 bytes
SHA-256: 75885f54c8331b66297c85b7d04dd379feeae023e19c3aa6fdb827fa576e0a41
font_01_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 10884 bytes
SHA-256: 8ed5ffb4d729bca4522a669e0dc387bfb4f78a94b93a822ebc3c25121e835265
font_02_sfnt_off000126cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1