Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd23dcea983b0fa9…

MALICIOUS

PDF

73.7 KB Created: 2021-09-27 04:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f790e49d6a690a5b157b4e0c0e98d2d9 SHA-1: 952d875e30f0537165d965e8d408f6b02bc55841 SHA-256: cd23dcea983b0fa9d806a9da951866de27669fff54a898889ec7102dc3bdacd1
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://behtarinekhodetbash.com/files/files/sudikimomilifutumujo.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/tisegixovokezusokifa.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/67142104186.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba758f1687---juvetifitixopogik.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/81642178437.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/83487969650.pdfIn PDF document text
    • http://amandatour.ru/js/ckfinder/userfiles/files/kekobebikugotazux.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/36567814783.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/zavizoloketazitirusili.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8386c770b---95250763405.pdfIn PDF document text
    • https://yifff.se/userfiles/file/dozopevotuzizujevanemuvet.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161380fa72c880---47891031170.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16150fcf5dd6cc---mulefebebuwomora.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614162d83c4f3---zekekel.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161496f9c5149b---kojivumofujitupu.pdfIn PDF document text
    • http://soc-in.com/data/media/files/sevimudedipukob.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/44803019926.pdfIn PDF document text
    • http://strap.sk/uploads/files/92249487175.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/famebitavapukokewo.pdfIn PDF document text
    • http://carszana.com/image/upload/File/nanogezaxupawedek.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/renusarenefakodoka.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/60870451437.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090421585473499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=happymod+ios+among+usPDF 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_off0000b674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB674 10564 bytes
SHA-256: e2d6b83a335efa4fc0a5dc74936e3314ff0d3d9b26ec4b865946a15a8db10d77
font_01_sfnt_off0000ce40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 19544 bytes
SHA-256: 039f36538c0d6fc94f3181cd26a03530c9f00c3f9369d9f25faaea8d16fbe780
font_02_sfnt_off00010110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1