Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e3b1b7502d8e77…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 11:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ee7cef51234fb7067c3fb4bf53baf0fd SHA-1: 33394abf3fec38f8bbfe31e82670aa8a9c394938 SHA-256: b0e3b1b7502d8e77015a7c9f67c86d3c5182ab5467b872cd3e2e50f2208198af
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, and heuristics confirm it's a link farm on disposable hosting. While no scripts were extracted, the structure and URL distribution suggest an attempt to manipulate search engine results or lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2835d607d---domogekiba.pdf In PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/045c4bcc1576d0a4096606c1b81094e1/lizewot.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/46807e63ae18558fb7471d82f6ed7128/41905977100.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210507023348.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/dajodikulemibuped.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/pamiwatotuvodele.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/f5502824bbcc6ff56bb2af91b3b639c9/sugewowedutamitidatoveda.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3f036bdf1---molumegiguj.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/76239687849.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b795949ce---96848350803.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160befba283938---16252275841.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160808c758f784---kivisepusidaroj.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/pofunax.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c7b1566e0---wuxalipuvoveruba.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae39c113aa8---zilisadazewenikum.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e38c59616---69942493518.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160aba443d5b6f---jarupojawawipagunitoze.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/tixomuzewerox.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/80149147693.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/dbtfshuk3aih8ls8tn8okkvf73/zetobem.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/bimiwokuripipuragepu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/16ee08d74617b3b7afc0928318245710/maranukutesupuvam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=xml+questions+and+answers+for+interviewPDF 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_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10920 bytes
SHA-256: 7de3fef65c1f05f56cf4bd801df4965ac86d56e0f0363de548da9f33c106a38e
font_01_sfnt_off000115a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A5 16864 bytes
SHA-256: edee83b655c3789e288f40658dd2333106d479a092aac8ecd5856941c687cd58
font_02_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1