Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc932ed90e940ec…

MALICIOUS

PDF

73.0 KB Created: 2021-09-06 23:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fbb6b51e23a1633a9bc94ddb31e6a12e SHA-1: 8925c2f06ebe51d11128e08abd7f5307a7858dae SHA-256: abc932ed90e940ec58e15b7c18d3395b8a2cb1d2169909f6cd1fa8e28a516e7f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised websites, indicating a likely distribution or phishing campaign. The ML classifier strongly flagged this PDF as malicious, and several heuristics identified it as a link farm on disposable or compromised hosting. No scripts were extracted, but the structure suggests a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.marjojaspers.nl/ckfinder/userfiles/files/puxolezumam.pdf In PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a6bf2bf2984---fobavifudijivunujat.pdfIn PDF document text
    • http://www.emailposte.com/pictures/labimekajiruwavu.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a87603a9077---20197930486.pdfIn PDF document text
    • https://ratosatu.com/contents/files/wunipenak.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/gabuwasagom.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/62313969991.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0225db3b---jijobajaja.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1611e27fedfa83---1657809613.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cad64f4aa---wisadawoximutiwomax.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/59629375655.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f7bf010ad4e---97941055660.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fc23500e61---komepetamasodeladuziva.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/19336709851.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/39fd17c72792c3627d8805582221b415/ropiropafegago.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609916f69ec0a---fetefofozipomojebi.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15552919327.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3304057be93899671314f54c14bf23fd/pedesamoluwomufuwaxabajak.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/59757752990.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/taxak.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/rewudofodizekusig.pdfIn PDF document text
    • https://www.agcontraincendios.es//ckfinder/userfiles/files/3626364449.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/sukel.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/82psjufi81oti6qs3rg6bmptk4/13640309309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=bemba+pocket+dictionary+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_off0000b89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB89D 10968 bytes
SHA-256: 6d4e34c05ef62306d885f573021dc11aa988429bbf95e7493f00da85a0d3b195
font_01_sfnt_off0000d1e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E4 17128 bytes
SHA-256: 694cf6f42f9ceb09aaf63d71d541624acb1292b7d27a701f087a8d29389e3d72
font_02_sfnt_off0000fe42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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