Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4218767d3ed1507…

MALICIOUS

PDF

164.0 KB Created: 2021-10-09 15:27:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: eed773e6722bb63b42b07faeb839ea31 SHA-1: c58ba20bd0241e29aebd2108f9565deabe97f5d9 SHA-256: c4218767d3ed1507fbd1337793f10c888393aa40a0da950da3857f028b3dedb6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised or disposable domains, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=watch+justice+league+snyder+cut+fmovies PDF link annotation
    • https://macroedunet.com/userfiles/file/tefedujodirewatuli.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/fikezakifevigulirir.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/zovevewosetuxumuloju.pdfIn PDF document text
    • http://sewakendragroup.com/userfiles/file/90920684243.pdfIn PDF document text
    • https://cet.sk/res/file/gagizerajisizezoxoba.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/6303403049.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bachviet/20210919/file/gigelu.pdfIn PDF document text
    • http://jonme.net/ckupload/files/weledeti.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/eq9cn6ibhe794fct57kkq5acg2/6129659202.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/17668926405.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143e65691f9d---mudab.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/dudenaxazemuwununitur.pdfIn PDF document text
    • https://fpcofmacon.com/nbloom/fckuploads/file/matoz.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/7e631df3b19a6f24c72f0b55c4d490dd/19360382472.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/17500267957.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/mj00vneihuv2g1e7515d0gf5ug/jutorokugigafenologapura.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mevufetobalodux.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/35550150960.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/17039830683.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/tibufiniwu.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/sowujeponag.pdfIn PDF document text
    • https://gryf-wet.pl/ckfinder/userfiles/files/30582092708.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/gigoxe.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/26244929160.pdfIn PDF document text
    • http://oilspecchem.com/files/64272794639.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_off000216a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x216A8 11328 bytes
SHA-256: 49b93d67812756508feb4ec9e1972cc5895a288d0e01c85d4d8976987fe94db8
font_01_sfnt_off000230f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x230F1 21668 bytes
SHA-256: b71e1f6926f337c4b1a6ac6546933d0634d5021bc98c8376765840b2c3c67fe8
font_02_sfnt_off0002696e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2696E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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