Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b56cea8b15e2ee…

MALICIOUS

PDF

89.1 KB Created: 2021-06-28 18:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c64f4bd9935dd3bf5fd46d7391d2dfa5 SHA-1: 195ea4547d90bfa4902f920b834c4b1bec752e52 SHA-256: c4b56cea8b15e2eece3e14ea72c1f5bc17b9a256b91493f4ecc9cb3057cc0585
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which are hosted on disposable domains or compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the link farm behavior suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution. No specific scripts were extracted, but the PDF structure and heuristics point to a link-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://poorclarescork.ie/images/relesifususaveberefim.pdf
    • http://kaizousha.com/js/upload/files/93600774093.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086949b8e5c1---wesowenelagazamigi.pdf
    • https://gruntbudowa.pl/files/file/97152711557.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3cfdc6f05---liromu.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/428c5a4d0df6ea09fd6524da7420de28/pupazopetasimoribisepose.pdf
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/64291862000.pdf
    • http://daiichilogistics.com/uploads/news_file/52333869572.pdf
    • http://ziconiavip.com/uploadfck/file/gubedelimajilo.pdf
    • http://gadkowski.pl/repository/filemanager/file/72838790892.pdf
    • http://mictrogiang.com/userfiles/files/pisesepanoderaxik.pdf
    • https://alarrabnews.com/images/content/content/file/kagunikut.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/29c900603dc37f3c24e64056afb7d83b/43930251062.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe607f134a---lolomedupa.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/qu1n2vd2d2136qb98urpa2ort1/58079786779.pdf
    • https://vannordenvastgoed.nl/userfiles/file/rufanosezoma.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e7enagrl4fl23e0q3g7dec2f2u/rumolakubutokimizetabafuk.pdf
    • http://umiyawoodworks.com/fckdb/userfiles/file/98876729342.pdf
    • http://leaguengn.com/userfiles/file///31666302619.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/qau843ptghrepae2v3pe7svsmq/dosukifulug.pdf
    • http://shosholoza.de/file/57030021475.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e5dcb490e---66618102231.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16090762671f39---12784709532.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a921a4b374---41761150474.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/41898272456.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=owning+multiple+dogs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9dc.bin
b45f32b54026f59424fa3a7eddeeda4d37fc236e1584e1d2487502475c82783a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DC 10684 bytes
font_01_sfnt_off00011238.bin
2a803c8b9f9fe24fda55bee9bcf305e6dcb9ac62fc1a4ec5e65754f4ddbd2792
pdf-font-stream PDF embedded font (sfnt) at offset 0x11238 17272 bytes
font_02_sfnt_off00013f4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F4D 16792 bytes