Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1abe7ffcb4c4947…

MALICIOUS

PDF

84.2 KB Created: 2021-09-03 20:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c3b091434266fa3b033f9f93f781bf2 SHA-1: 54e084e9701d0ef3fe1e9a45c0a0acb086b2c720 SHA-256: e1abe7ffcb4c494734f41934695d5e708e3dc5d24d367ab34ea6201b8dd94367
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, limiting the analysis of direct execution vectors.

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://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/66d35901fe9229c3ef55f16436aa45c6/potuzi.pdf In PDF document text
    • https://balajitutorial.com/admin/userfiles/file/milor.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/76737405918.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/g159jsflljdpntqjv11g1mr253/gowavotefodejomesepulel.pdfIn PDF document text
    • http://familycrawford.com/clients/3/31/31f1fdc6e90c562b7578e9c437f7c1bf/File/gaketesekabi.pdfIn PDF document text
    • http://recrute.fr/files/files/fixaxukejinezuj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/11389194263.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/93732993202.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16083ef402b62d---venalebozizonunanisat.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/sikoforepowo.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/75486554822.pdfIn PDF document text
    • http://kezmosas.hu/files/file/28164498581.pdfIn PDF document text
    • http://18554080.com/userfiles/file/xavogavobinirepikuzox.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0185e2d20---duxumafu.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/68479634833.pdfIn PDF document text
    • https://nexusmediation.nl/files/66508683175.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995bba3cdcf---zoxegefokakuvopojevipiged.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mepibilavusevererox.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612939472e5af---girogadiwizitotafaf.pdfIn PDF document text
    • http://taxfreepoint.com/file/60881751029.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/54989851207.pdfIn PDF document text
    • https://mytopics.it/uploads/file/88876816144.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210725085543.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da5ae17712---60669824095.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/28095986897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=historia+de+la+unidad+de+cuidados+intensivos+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_off0000e01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01E 10772 bytes
SHA-256: cf1a40886324713806a4a6e1593921a19771c0bcd936e2875fffd3c078f6b18d
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 19628 bytes
SHA-256: 96a97756817795bd9dfc273f23991794ef4a24accd916022b0a9bd2c836efd83
font_02_sfnt_off00012a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1