Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a41b7d64498fe29…

MALICIOUS

PDF

74.4 KB Created: 2021-09-05 20:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8071a41178d8b7a2d9edb6c0007e9683 SHA-1: 14916547557fbe339a612e82dffb305c8b4d148f SHA-256: 6a41b7d64498fe29b7841b10e43b6b52e79a275defec23cc72b77d90c1a720ec
104 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a 'download button' heuristic further supports the intent to trick users into downloading content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/0febabce1aabc7c05eb728311350cff5/24569974253.pdf In PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088428b9c910---40632787271.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/0r8seqf078bt2tmap71umujfj0/10223927945.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/rozilekobagamozozedebeg.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a918c9e5---83576377605.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4f944f96---87596423293.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846eecede71---63567978458.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/66469281374.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082fde7a2630---33250755444.pdfIn PDF document text
    • http://aromamahabaleshwar.com/ckfinder/userfiles/files/77895618523.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/aa733527ff906f1fd8640d2599913714/tazubamumivepokujix.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/47840897118.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/xukogadimozikugunate.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/wufaguwewiduretotivu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/65215043725.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/5abcf7be6b0b8b4b47d86cb939f36b5f/kegafi.pdfIn PDF document text
    • https://irrisyst.eu/files/file/kosegumagukupodok.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/mukodeb.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/76461257719.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/tezusovetapikuwikex.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e5f942a8---rimifefufuvowana.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b125bd99392---kebogobepebotolowux.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/fh5cr8jgrrq7ejjaehmf46cve2/zegokimubog.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/fa6t27f8hru9jg76bdfaocv4mq/68778577464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cpe+use+of+english+1+key+pdfPDF 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_off0000be7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD691 17172 bytes
SHA-256: 6de7b5b67d439ed58edd6a0485f50c153491f85f480f9bc5a2d792a8c92850a9
font_02_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 10808 bytes
SHA-256: b5c17bcb71b89f1759849c0d015d55ab2b59461980ed2544881e4d35ec602e6c