Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7140ae35925cfb5…

MALICIOUS

PDF

76.2 KB Created: 2021-07-06 02:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8f2f5f88cbaaf640f34f13c658ff3a81 SHA-1: 65f4b1281bae1e74dc58b511265d9aaafad078a0 SHA-256: b7140ae35925cfb59903a2492fc60e8965bdb7ccc8c1692d52c9a1e109a21d5f
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point 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 heuristics identified it as a link farm on disposable hosting. While no scripts were extracted, the structure suggests the PDF's primary purpose is to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://assushop.com/userfiles/assushop.com/file/kosiwodozazurojasa.pdf In PDF document text
    • https://parc-hotel.info/file/75765810343.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160998f1b86691---mejuzejowejegazifo.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/1126eb364210b88fe9218719755a5fd0/funukopuwavalezuxi.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/zitesatufemujufifiga.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074af80132f7---39649981681.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/67095198767.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078334bb4560---62773280337.pdfIn PDF document text
    • http://aimic.com/userfiles/file/3918486187.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a0d91133a---11156734813.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/47944796153.pdfIn PDF document text
    • https://hirurgija.me//files/xovugador.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/supuj.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec8e266119---jebuxorulesareg.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/94000314918.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/745b1c8c76b8a124e6d913ea2afa5839/88630981319.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/63l1dvrb8q5buqt1s6nlmpkb42/91426012254.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/a3bf9c7dc9d3833dec77b3112a235a43/mizitugojopuw.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607732b5b949d---ronin.pdfIn PDF document text
    • http://zae.me/datafiles/file/diguwuxanogetewupupudije.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1db48e16d---83700512945.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/3ac07222b89b124fe4df0d64638d4b83/27994394117.pdfIn PDF document text
    • http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/54505605334.pdfIn PDF document text
    • http://podushka.by/files/files/84957566172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=scid+ii+questionnaire+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_off0000c509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC509 10888 bytes
SHA-256: 875ae523a7972b063bf7b6e80802ff0c95b8a985dc9648254fc8c1caece2e894
font_01_sfnt_off0000de24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF636 17284 bytes
SHA-256: 5a69e3e010b5b0e895611ee128115507f2c248d93d907bd54219505700fb6a6e

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