Malicious PDF — malware analysis report

Static analysis result for SHA-256 2893812cd6e2b251…

MALICIOUS

PDF

81.7 KB Created: 2021-08-18 11:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 39555845eac5e486bc6a5b8e6926966a SHA-1: 0d542a2bbf9a3ecbced887c1f85fcd03158999a1 SHA-256: 2893812cd6e2b2514ba15365d982f94640fe0f660ab70a947ba74ec85bbb7a6f
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicated maliciousness, and the structure suggests it's intended to lure users to external sites. While no scripts were extracted, the overall pattern of hosting numerous links on potentially compromised infrastructure points towards malicious intent, possibly for SEO spam or to serve further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/34b0f6be64fdd685312a373d665f5375/14256796952.pdf In PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/88585687323.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/sebifa.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c297ab9f998---24554434116.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/vedebikusubifonuzokodom.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/40357525572.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/45945820075.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/133fbbfd0c95ce45925beac19aec7c1c/zexutemubeb.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6241b91d7---lutoxemeromu.pdfIn PDF document text
    • http://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/etme36v20pn90tv6fe7m9hchn3/15993182158.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16099d1d5b09d6---81219693530.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ed21f20e9fecabcdb29ea6e268d97b32/dakipuxewizudov.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/9962db4d490145cf770368850e76587b/86148367730.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/598972711343b9ca12f29f1315a36648/tirabizevefamemagara.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31d5437698---19189838957.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114351646395---77712517832.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/cb1luseuqgfvri1j4scnso7guo/rirowafepe.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/zazemoxotimegezixab.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/xefap.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d229c170b7---tiwodomilesanub.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/7ce94d4684cb84da8bb191f4b7d45bc7/ziwapi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/linuxag.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/riranesisinawifi.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/tadapewusosovevuxu.pdfIn PDF document text
    • https://digireg.cn/upload/97943752050.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=10+ejercicios+de+lanzamiento+vertical+hacia+arriba+resueltosPDF 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_off0000d746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD746 11208 bytes
SHA-256: e5ba1b6f3d3dc21e9f1e0834f0abb4bf096be2b5f50758baa0e7cfad1f2edf51
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10961 17776 bytes
SHA-256: 1d2370606fb6d164afcb24194bad8dbc60070915deb3328475af0df06db41d4a