Malicious PDF — malware analysis report

Static analysis result for SHA-256 48aeed123d07af9f…

MALICIOUS

PDF

86.3 KB Created: 2021-08-03 02:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a8c7f4760a9d1119bf210178c398e62d SHA-1: 8e4ab1631c974efc742e279448c7854a2e385723 SHA-256: 48aeed123d07af9f6a61f506f59dde86da13c07ac3259efcd30d3b0151247726
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/33d6570517593a3561e71559117d16c2/9070202552.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815cf2bd723---wijozizetosapilanuwuw.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/44379914122.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ed17f569---xilakujulemofiso.pdf
    • https://qqhanoman.com/contents//files/19198777447.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16088f49de307a---16911530899.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c96a4c2818---lotamox.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/93372669441.pdf
    • http://jgbt.us/pds/userfiles/files/pepasam.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/36924772998.pdf
    • https://apsco.ly/userfiles/files/momonuvodivix.pdf
    • https://sieuthimayphat.com/ckfinder/userfiles/files/56155198761.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/3a697430bd334c3222db7e5c8ba5f6bb/lizezifumaxanaluz.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a14a4420f---todiduwibegilafox.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608602a6dd358---82884296409.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xixizovo.pdf
    • http://kimhoatra.vn/upload/fckimagesfile/xofawusiwulepof.pdf
    • http://btc-ltd.com/upload/file/rekisizatodub.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/dc7074c656d4306bcd408fc8624474c8/12194316310.pdf
    • http://poltinka.ru/userfiles/file/30594434942.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac657eb8520---82377779771.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=modeling+linear+equations+worksheet+pdf
    • 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_off0000eac6.bin
12c69b70a99f64cf5b05f88228277acd2ab282f69add251d037e10f22fd77ffc
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC6 11192 bytes
font_01_sfnt_off00010471.bin
45ff9aff33eb9a4559056df3689cdc33470a70e66ec3f67e79d97293dcfb1930
pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 17844 bytes
font_02_sfnt_off00013323.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13323 16792 bytes