Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d22e76e8ff3960f…

MALICIOUS

PDF

77.5 KB Created: 2021-07-02 04:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a9da61db761267ad9e39294b30906912 SHA-1: efadf8a884521c5521990718484fdc8ec7038383 SHA-256: 7d22e76e8ff3960fbdf396bdff7607b9b551f6d97d0d2db08493a30aa6ebb734
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs suggests an attempt to lead users to malicious content or phishing sites. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://infrive.ru/uplcv?utm_term=pirates+of+the+caribbean+theme+1+hour PDF link annotation
    • http://shinies.ru/img/lib/file/rawivatekopejibaxakotubeg.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/mp8t26gv2ofqbe544u5j2ufbf9n03ftm/rugiregola.pdfIn PDF document text
    • https://lexconsulting.ro/webroot/files/media/72632185853.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/siborizulideperomumawulex.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/4f3cfac531d084001fca0326cd52035f/pekodegabuvamidetezivad.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/94665403598.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/262c4123afbe3cae6a594f2da614349f/62837864485.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/f108da624ace3e07ec1a4840da673f65/68436343681.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/4854120805.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160786a5a9542a---xetakij.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/mewafonuzoxopaja.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/39fac0c5281136b23f90e6a561fe708a/zegotojidimurunomede.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b801f68f0d6---93717256764.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/fofujonojikerizupi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/bigenobikewipegela.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0146746c4926815f60319187b0ad86c6/dupes.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d088513a9c7---1561946766.pdfIn PDF document text
    • https://baongochoa.com/upload/file/24390709016.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/xewonegipabi.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/5b8f162286060d5f28bfeef22d2633ed/sozezefosagaxalasuvu.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/fb8dc5d14ff2dbec299afc174338f1f6/fesididazuxixexejeg.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cc1a5afa6---3673049909.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073989c1ca2d---vamomur.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c54ffaa560e---75194946865.pdfIn PDF document text
    • http://dribblebar.pl/userfiles/file/lupapimibugulagude.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF63 17744 bytes
SHA-256: cdf10de9d9409c33d4578bb9067feda41e320aa8a0ece2614c411975a266aefc
font_02_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 10848 bytes
SHA-256: c5f9a5f3ed56cb453cc654e37604a12fc05f18f137a086305f2de471cae349c2