Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa3d58b25ac9c17…

MALICIOUS

PDF

109.5 KB Created: 2021-08-21 10:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 51d4c6c02fe6981f4363d76fe7159cc7 SHA-1: 5a02ed73fdd40b37d3802d140b97ece0f74290e4 SHA-256: 5fa3d58b25ac9c171c10b293eab576f6a817bc4e18faf1b0b5b147cd686df24f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ehoron21.mn/uploads/files/80800492137.pdf In PDF document text
    • https://ancoraeducacion.com/images/80460379141.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/83797026687.pdfIn PDF document text
    • http://dollreunion2020.com/clients/4/43/4392dc7a9e9236654a628da0af121bbb/File/fagipafazezizoluvoro.pdfIn PDF document text
    • http://afro-safari.com/upload/files/22203614798.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/5lku4bi6pp3kprs14o5a7v1saf/wegikanorepetewinu.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/07/24/fojarem.pdfIn PDF document text
    • http://bliksis.ru/userfiles/file/lokuwud.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/319f814b26ee419c4ea526895d11e6f8/40113451270.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160babdf00d06c---86522191746.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/81766373890.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/rtq33rmi0p3i4dg46g74vel7id/81151283017.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/75333581340.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/zamewuzebefivekija.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3607c1c7e---vavuvifadebima.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/b9lsh157jr1k49mm9rjftibnm5/50505651610.pdfIn PDF document text
    • https://lnpro.in/ckfinder/userfiles/files/levokirilewozojapu.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/83520497837.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d057b6da5f---61137757063.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/wegovulobuviwetofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=chapter+3+cells+and+tissues+answer+key+pdfPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/80685090821.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_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 17852 bytes
SHA-256: 6ba3d5314d517365a152be8b9eee5d4dcc4913694eec0193eaddf664f4ad7042
font_01_sfnt_off00017508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17508 11192 bytes
SHA-256: d60e82e07778b2c41784dc45fb25905ed133423ae99c34ff0c79cddd18d653c0
font_02_sfnt_off00018f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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