Malicious PDF — malware analysis report

Static analysis result for SHA-256 f621dc450413e08f…

MALICIOUS

PDF

86.6 KB Created: 2021-10-07 17:26:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: d82e051403034a1426de9b5d128d2ab4 SHA-1: 8d0ea0bcd144638e9a48cdaef484c9b010724925 SHA-256: f621dc450413e08f83e714c12dd1f843e5a06a83da166d9363b97c2cf499070e
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to lure users to malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://ketchas.ru/uplcv?utm_term=inner+ear+ache+and+jaw+pain PDF link annotation
    • http://balcimimarlik.com/resimler/files/1689374420.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/bawesisofafobunubo.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85007837991.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/jarevinebejalokegasogova.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/21455544296.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/teluketusiruwezugiwaweri.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/doporajipova.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/30471614787.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/m20mappca20t1lrca0k4a12dh6/sagamaxi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161432734f408a---foligufetomekitak.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/gopepisokifedepeboxomera.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/47324138747.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202109151426417559.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/topimagi.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/sirafowekuwaminafibikux.pdfIn PDF document text
    • http://ceroki.com/image/files/tosokimaveratiko.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/datoj.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ipfbovb2kuqflcturq1qjh5on5/59890247929.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf9ae2bc4a---mabavejorudinalufugajoti.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/29987682059.pdfIn PDF document text
    • http://vkts.se/userfiles/file/taveja.pdfIn PDF document text
    • http://hengfengpaper.com/filespath/files/20210923121050.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/76989218022.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139f7d274c49---zadepimimidezeto.pdfIn PDF document text
    • http://taigesw.com/upload/files/vasugilepetoxujiwi.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161585509204d5---lurogonijeduwez.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/16471661608.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_off0000eee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE2 10348 bytes
SHA-256: 40be672d86b8b05cb079b2d999708f1045de4abaca35dce8c9a7c19161664b9a
font_01_sfnt_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 18308 bytes
SHA-256: 6c2e085328b856464e5326c7db947728e40d76d361b2d132cd62cbe3de4af47f
font_02_sfnt_off0001344f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1344F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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