Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef9a1f56b34e564…

MALICIOUS

PDF

84.0 KB Created: 2021-09-03 00:13:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b8f025f3cd49090830389364e8a8ba4 SHA-1: 08059c05379c10c03d798a16ad1fdbec51ebe2f0 SHA-256: 0ef9a1f56b34e564f04852477f40a20d851100e01c9415e96ff213cc19fdd880
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs suggests an attempt to redirect users to potentially harmful content or phishing sites. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=create+fillable+pdf+form+calculations PDF link annotation
    • http://teormech.ru/teormech/usrimg/file/futado.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b49dd7a9b5a3c46568ac01eecbf3a687/xefakibufibukot.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d6bbae157---sofiwuvebilogojexijineke.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849d85f2bce---68740500223.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/92231096951.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870c478ea4c---59359574002.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021082505283358.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9e0c6c7c8e0e6bf760e71d0cb17b7e7f/waguwedibulotanadabenazez.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1263d03b---datimudadusupodiji.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/96239106632.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/katewixazaze.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3ef40623f---limusorizafe.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/65120441125.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/tuvum.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8ea3f26f50a7bed522f978fa814fe5bd/37319310061.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5il2m0v89jr0bh9rhppoqpts8p/6484401190.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/tilimewekowawubigo.pdfIn PDF document text
    • http://mopron.ru/upload/files/74693809352.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/16088448a620fe---89935572965.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/8906981868.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/ximabed.pdfIn PDF document text
    • http://spl-designs.com/ckfinder/userfiles/files/70777297558.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/wazewoguxurawakifepusamef.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/75012bff58122dc0cb8e4a024075e221/josabirafodumujuzet.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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 18832 bytes
SHA-256: 0af530ff06adc2aba715b127cbe78d492ee3d47892fa3f5069d44154bcaffedb
font_01_sfnt_off00011030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11030 11052 bytes
SHA-256: ec5f45a375766c85cee7c47064e9d99dfb7a36a4256a64fa9ee6b3b25da39dc4
font_02_sfnt_off000129b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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