Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb9ae54369a1ad8…

MALICIOUS

PDF

101.2 KB Created: 2021-09-09 02:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d32ea74ff72eed19cb4c9a8b8278f311 SHA-1: 46d1a6260f8822bdcc98fb14abb13b00ba4c7cb8 SHA-256: 4bb9ae54369a1ad895432f3409625d805756cbd75c78b9436e4d385ad251cbfc
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siam-royal-view.ru/data/files/51550167045.pdf
    • http://lanaecoloridabruzzo.it/userfiles/file/23690003156.pdf
    • http://ideviceplus.be/app/webroot/files/userfiles/files/vikumimaranudotuwodaduvo.pdf
    • https://ehlibeytalimleri.com/resimler/files/gemumekesigoxigopajota.pdf
    • https://amatnieks.lv/pictures/image/zumaralifo.pdf
    • http://cobe-ing.it/userfiles/files/57078518256.pdf
    • http://xmzs.org/userfiles/file/48143648848.pdf
    • https://bellcera.60km.com/upload/files/26575720341.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a44faf6ea---mekivuwer.pdf
    • https://global-brand.net/userfiles/files/zesaxuguforefop.pdf
    • http://scouttautomotive.com/editor_uploads/system/files/33022157830.pdf
    • https://mwasafat.com/uploads/files/magotibakofavokav.pdf
    • https://jahanchart.ir/data/files/file/gelitubupokedumovutamigal.pdf
    • http://galenbio.com/images/upload/file/38773310767.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613859df06067---pawoxoxifoda.pdf
    • http://swiss-ex.com/images/blog/file/wotukejenevo.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aa403849---wuwamoduwig.pdf
    • https://igescanada.com/ckfinder/userfiles/files/kadakesejizemubeniviba.pdf
    • http://4chan.ro/UserFiles/file/mojagoxitutipiteruxez.pdf
    • http://rileyillustration.com/images/agency/files/wivekajokefogojavabina.pdf
    • http://erpos.sk/data/files/nazesigug.pdf
    • https://www.stock2morrow.com/ckfinder/userfiles/files/darewamijopagabudivew.pdf
    • http://mini-garden.ru/userfiles/file/8944353259.pdf
    • http://appartementslisa.it/an3_Uploads/file/fedokexegufar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=boardwalk+empire+streaming+free
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012388.bin
7584de0a63e90d430f4d106611dd3740ff9c551e88f506c0706d43df471555f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12388 11072 bytes
font_01_sfnt_off00013d34.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D34 16792 bytes
font_02_sfnt_off00015546.bin
43dc17d1c0f19e159816e02433d93dfee25784ba5a88036288b8c958eb7a159b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15546 19080 bytes

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