Malicious PDF — malware analysis report

Static analysis result for SHA-256 00dc825283fc0884…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 10:30:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f004887002e10d46a516f05e9e8d19b6 SHA-1: 15232985781c857bfe65a1851395f3156c72cfcf SHA-256: 00dc825283fc0884c4a3ef5ff818f0e5ebc0fd1ba191a2041a396ec7031f7f0e
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent, likely to redirect users to a phishing or malware download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://manpukuorder.com/uploads/files/lepokezapomova.pdf In PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebb4aa8ca8---natuwakolo.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/31017095312.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/lebutuveb.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/ruloraxolemox.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/40588377414.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614436a4e0333---vamaxovujuxumilepavobu.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/27813863007.pdfIn PDF document text
    • https://congchung7.vn/upload/file/jojulu.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/95786050831.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44919491968.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/madotabejowarusarunix.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/rewowuzuzadilikakero.pdfIn PDF document text
    • http://flyingwedge.com/uploads/assets/file/naxavidalijavalotopeg.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/51014124888.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/90326620600.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/10958162802.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/januvolozolefu.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/88408909196.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8a173b767---6738780938.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/70382037708.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/korofulimamafelujug.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/livivi.pdfIn PDF document text
    • http://daotaonhaccong.com/uploads/userfiles/file/lapoxer.pdfIn PDF document text
    • http://bienbao.net/uploads/files/zajavonijogadukawunaw.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/volekovuvim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=watch+rupaul%27s+drag+race+all+stars+season+4PDF 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_off0000b3ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3ED 10904 bytes
SHA-256: 1653e070c8d9749e95ce20141f17f20d86522d23622b3c796a99545fb6a6beab
font_01_sfnt_off0000cd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e521.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE521 15932 bytes
SHA-256: 707a8b82148de6e865aa18f071c5d4ae44ba0322b5aa6587b0126be8fbcbfeaf