Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea17de78661f26bf…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 16:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c185461d8447b577face642e0fd71394 SHA-1: f48bf0f51de6d0ada9dd7dcdeac1da2d212d9071 SHA-256: ea17de78661f26bf324267f5c16b5468865222057c115f2941c39926e00fcc51
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised websites, indicating a malicious intent to redirect users to potentially harmful content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was unreadable, so the analysis relies on the PDF-specific heuristics and extracted URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://gz-theoutfit.com/UploadFiles/FCKeditor/20210911055230.pdf In PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e06e01a6f---regusuxisiwakov.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/75353630075.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/fipusademe.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/jabeni.pdfIn PDF document text
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/41140252897.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/98415988623.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-8/20210908015728940586.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/45784766394.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/1070dee084e88ac8bd248e725a943dea/kugafijaxeduke.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-5/20210905103337350019.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/99349477722.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/tebanujerujixew.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/99925412803.pdfIn PDF document text
    • http://inercial.es/uploads/files/rutiduvivavamijadi.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/35643419494.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/vosesemolevukanonogule.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136acf6597b1---61139930539.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/sozakibinivubosul.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/pepekisezaxudanobim.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/ruruzog.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/13145156993.pdfIn PDF document text
    • https://weekendtripskolkata.com/userfiles/file/dokok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=google+play+services+jar+android+studioPDF 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_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 11140 bytes
SHA-256: 94ac20a1db26f383935ff46fb0ab26f28f629f25f9d81ec03c1f37193b03c0dd
font_01_sfnt_off0000efee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 16544 bytes
SHA-256: 2ee29ab289d4aa067bb42a36dc4639ef3c0841d8851ecba12f49e1778598171e
font_02_sfnt_off00011af5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1