Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e79fa5c2ec5a47…

MALICIOUS

PDF

76.3 KB Created: 2021-08-28 00:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7c2720282540cecc63f1f3c7e54297ba SHA-1: 94047290ac7a2b5e5ccbaed3a4eef63b619aa391 SHA-256: b5e79fa5c2ec5a474003ecb2e2d39482a6af859808f100b97f6be09e109dc46f
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is part of a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f2aaa4281---15507772080.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160843f954a32e---xiwudapep.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bdh1gc79j6le46s1th6dl19qb1/wuragaven.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/500eb143581bd1237636914fc98de69d/nuboparuvizubujaneged.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/risugetubusujirotogenab.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/41964709438.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/fabowomepiwi.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/53090460909.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/witoxigubokom.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/f9b7c625998ff068eb8bda1ad9d79e2f/69418374786.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6437d2660e---mawefisulesitirigowoxurud.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kixekemupowuwejerula.pdfIn PDF document text
    • http://shahnawazonline.com/uploads/files/gipudoxesoxunekenizokis.pdfIn PDF document text
    • http://globeksa.com/ckfinder/userfiles/files/4926701503.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160739ea4eb79b---1955042854.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/46170574135.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609691b2779fb---gibofelasenibumafesaveno.pdfIn PDF document text
    • https://castel.ro/userfiles/file/35202372672.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160877d1b15401---morekumovu.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/18095551747.pdfIn PDF document text
    • http://rubivina.com/Images_upload/files/nawerike.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/98114211663.pdfIn PDF document text
    • https://shinko-tw.com/UserFiles/file/pixovigemunosolegojanim.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160787f8af3bea---86914436899.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/e9477fa04724929410463d894533b509/47868276708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=crispin+at+the+edge+of+the+world+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_off0000c442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC442 17784 bytes
SHA-256: b083797864cd1a3963aca0c28934605e3d9e944f9d989e2a95e6a85f772ad976
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10896 bytes
SHA-256: 6e5b0d7ce83b849713e969f577b74136a3d61689caf0ea3a5a1c9d4492519f30
font_02_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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