Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07f2678e8257faa…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 02:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c164febd96fb8e6c1b23d98064bd2e7 SHA-1: 21344954dcb7a0fd704bca048c24d2f5c12879af SHA-256: c07f2678e8257faabc04dc3919d80bb10015adf84fa2bf97135de9445fd3a469
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains numerous links pointing to other PDF files hosted on compromised WordPress sites and disposable domains, indicating a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple external URIs and compromised CMS upload links supports this assessment. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, suggesting it was generated programmatically rather than being a user-facing document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=2008+nissan+pathfinder+manual+mode PDF link annotation
    • https://aduanaldelvalle.com/userfiles/file/pafekoxosepobok.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/pines.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/wolokamefomiw.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/widarakomiv.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cc6c755ae---26986148689.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a6dacbc55---rarobutas.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/kazopuvoveduzanixawad.pdfIn PDF document text
    • https://chp-travel.ir/data/file/bixuvidakupij.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jiganepumitevigipipaf.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16080470bdc5b6---kogamakonelesijuwifupof.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808f80a6cfb---webuselixegelal.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb66d0f762---sewobomonizapipari.pdfIn PDF document text
    • http://contua.org/userfiles/file/javidizire.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/30366474131.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e135f0e7e---votuwojedazujaminufirusi.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/dewaviwosoligotifaserem.pdfIn PDF document text
    • http://thevale.us/userimages/loxelupuwumaw.pdfIn PDF document text
    • https://faceless.me/userfiles/files/pefufijebomos.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a39f86858f---64009765664.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1606f074f4b714---97162865140.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/ce578526c0fe3a8b9e4f047125e87685/84722122712.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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 11216 bytes
SHA-256: ae0347d7f803a42979e425eb5c0c2a5b62824eb4411475a9d006f9a49aa08437
font_01_sfnt_off0000f15c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15C 16884 bytes
SHA-256: 1ef66838275bb1edfb06e737bb0f04eee87f74dbf93b3077021adf9a2ab83e94
font_02_sfnt_off00011cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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