Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea846192a31ec439…

MALICIOUS

PDF

79.1 KB Created: 2021-09-13 04:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8f9f682c7c35086c8534810213540884 SHA-1: 9033a9cff27dcb488a4060e373d9bdcbe324c3d4 SHA-256: ea846192a31ec4395381050ebecbeaaf76244ff0ac58a5b2127cfe480acdea15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 https://oniceh.ru/uplcv?utm_term=avengers+endgame+online+free+123 PDF link annotation
    • http://deauville.ru/files/file/76186200730.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/19046481174.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da8bca4cfb---zonumopatopipikaf.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/neradawedonokaxoxiwokubu.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/runidizarevaromatov.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/4284524401.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/gimazafalikululiros.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/32503533722.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/deporizimosozuwudorobexa.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/lesijuviwivog.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/48130511601.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/41147534176.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210909194921_mhgn7o.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/69629369249.pdfIn PDF document text
    • http://riph.pl/userfiles/file/rufubaloxeve.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/88825576530.pdfIn PDF document text
    • https://www.aaptuk.org/ckfinder/userfiles/files/79951333414.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/c4e2ca1d10d59720ec47b52bedd22855/sibizuvafewoti.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/jukag.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/zozaziwopizofibewujag.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210910135658.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137a35bbf3a3---54703413574.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/mobezesuvokininibuvovi.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/wiwaziposapog.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/49486096271.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/96595975561.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_off0000cfb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB4 17600 bytes
SHA-256: 5cfed1b0e199a5ff7dd97637f48d324ee7c7412cfa4e786982abc986cf7b04d2
font_01_sfnt_off0000fd71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD71 10988 bytes
SHA-256: d17584833a6743a83c2b005544879899c15fcf8b092797ad861c6e84a6b46cd7
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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