Malicious PDF — malware analysis report

Static analysis result for SHA-256 e941c4c6822b801f…

MALICIOUS

PDF

85.8 KB Created: 2021-07-20 08:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 43e144ad9f197d387d3d78d6d4f776ad SHA-1: 4998a2d28cdaef180a3f349341dadb46f8f57959 SHA-256: e941c4c6822b801f9aead9a7f910f071a249dd4b8d5a5be73710c820559b9940
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 multiple compromised WordPress sites, likely designed to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs on potentially compromised infrastructure supports this. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16089b5dfa0eab---lodapajepire.pdf In PDF document text
    • http://bandenplaats.nl/cmsimages/file/84746929637.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1427cc39ab720f69e875962a9554284b/95611122310.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/30679677501.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37d5cc5d0---61352257629.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/75213193988.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/pototakusabo.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/825340288441620577832.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/5638986201.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b44fd50b7a0---bunijituzebowuxokaz.pdfIn PDF document text
    • http://wfuchiomega.com/clients/4/46/46a815049f9cfb11ab63b386d19cdfb8/File/gadiludajigusarelizin.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/kfcbqkogeflfue2bnjnfit4qcu/69056749443.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/safowijokotokosalogexiga.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/26502000737.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbd4578726---90012721271.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/9c730b13ca162cc1c5a5adcc6a322bee/wigoruwetonazajaruri.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/22971838451.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cad4b6e8193---42995002553.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents//files/fupefa.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cec0ef8f6851a8ac5a0187e9f4795535/51763581115.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4627abd578---17717999753.pdfIn PDF document text
    • https://activepymes.com/pub/file/kezajikifavipibumib.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087659f72b0f---rorosokaxixisetotabufumot.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e35b9c3f7---13600566265.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=i+wanna+love+you+pretty+young+thing+walePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9F 17820 bytes
SHA-256: 939053386ace56118a0ba794050541ef28d2a2d992df769c389a7e2e4203e78b
font_01_sfnt_off00011972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11972 10680 bytes
SHA-256: 263011eb47c09f4098fa4b7bc076923f5004c8b60a3d5a0ff1f63ee3f8d8fd12
font_02_sfnt_off000131e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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