Malicious PDF — malware analysis report

Static analysis result for SHA-256 804586af7ea74407…

MALICIOUS

PDF

134.2 KB Created: 2021-08-03 15:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 242d7cd0074dfacc8e0ce8ff9eba008d SHA-1: 35f7685928c9a030b815c2107a123cf4108d96e1 SHA-256: 804586af7ea74407f215e4f0da281e366f686a8179e0740ad63acc7db6c6ae33
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to disguise malicious links. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://coretry.ru/uplcv?utm_term=test+bank+for+fundamentals+of+english+grammar+third+edition+pdf PDF link annotation
    • http://meechoktoolmart.com/user_img/files/14259676820.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/68027971012.pdfIn PDF document text
    • https://thietbidiensino.vn/media/ftp/file/vafapas.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37e57dcc6a---zirijevapojosupufolabusiv.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091aa9a3ef7e---97636951632.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2846532495.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/5ef70cefaae3a4b654b32605d93e9f1f/tigurelarufujexevexivifuw.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/ganaw.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925e13d37d3---zuxizumut.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d41fe5ef91---bumojavenabomade.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/roveta.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34ba59c58---jonevenexegewidixi.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/38616217046.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/xosiwafugowod.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7516e784a---22936922719.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/zimeniredinexogiwijufe.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/cd1c96fa0b104d0a9a0af915eaca6faf/dimelajixofop.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f14695fb17---zimokuxusojalekolex.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/juduvajesadokibavajam.pdfIn PDF document text
    • https://ckmandarin.com/uploads/fakuwiz.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160887ec99df67---80698433658.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/nanufezoxawulifonid.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q9ubovt51fagfq8l1pio2ug7ca/3855241454.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_off0001a596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A596 11240 bytes
SHA-256: 20ae0a1fb1b215d777dc08f20f8673196a1b4defcccce21bb94bf0acf0673f23
font_01_sfnt_off0001bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BF55 18604 bytes
SHA-256: 50867541033c7bce00b34e0ed1951ea11fcea64caf60acbc79bb6a89d7724422
font_02_sfnt_off0001f11a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F11A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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