Malicious PDF — malware analysis report

Static analysis result for SHA-256 e416e5ed46eae957…

MALICIOUS

PDF

86.6 KB Created: 2021-09-17 19:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b0d5fbad580480d6b6a50a36ca6eb5d SHA-1: 42509582ab3e59fa85de71a7e199f78c95f8ee58 SHA-256: e416e5ed46eae957e5383a24808532de805600d285e2e05c8469d1d3157a6d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to redirect users to potentially malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure suggest an attempt to exploit users by directing them to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://queure.ru/uplcv?utm_term=firebase+push+notification+foreground
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5a04981b---71445213070.pdf
    • http://fatimaartwork.com/userfiles/file/33519210346.pdf
    • http://daejonggyoyc.com/userfiles/file/20210914084503.pdf
    • https://shieldtech.cz/ckfinder/userfiles/files/71907178223.pdf
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/79893786408.pdf
    • http://miraesusan.com/ckupload/files/52487471961.pdf
    • http://ourdesign.hk/ckfinder/userfiles/files/renamomim.pdf
    • http://marktoby.com/akram/know_news/admin/userfiles/file/97102620274.pdf
    • http://zsdbiopharm.com/upload/files/61626520356.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613ecb506e306---46530150896.pdf
    • https://dbmotorbrokers.com/userfiles/file/71397357552.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4a59f977---67519490687.pdf
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/pinozodotewokusebijedafa.pdf
    • http://kayapalinakliyat.net/file/90985848736.pdf
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/87645272660.pdf
    • http://klasykarozrywki.pl/public/images/fck/file/zidatabifox.pdf
    • http://dienlanhhuubinh.com/upload/files/3415765445.pdf
    • https://kawanmto.com/contents/files/zujilenozivem.pdf
    • http://italiangreyhound.pl/img1/userfiles/file/petexekiletuluzir.pdf
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614138078a8e1---36556779194.pdf
    • http://seamcc.com/UserFiles/files/nadotaponifevobe.pdf
    • http://hrjok.com/uploadfile/file/42322130589.pdf
    • http://dorapeyzaj.com/userfiles/file/79972008652.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/kng79fa5n7dr442utbb74k6kjp/legevi.pdf
    • http://gemcom.org/userfiles/file/fegusuxamuwopulin.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/gesizelaj.pdf
    • http://vinmexindia.com/uploads/toberonanigeregafakoravub.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_off0000ec10.bin
9e3e0b787dfefb05f3646f825001a08ec9198f23cf6db1f4182e10208e993b8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 11068 bytes
font_01_sfnt_off00010559.bin
2860cd4cf0ebdd9958eebc27b38759bbc296f6287c0ef6cfeefdb4cb530c2126
pdf-font-stream PDF embedded font (sfnt) at offset 0x10559 18296 bytes
font_02_sfnt_off00013477.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13477 16792 bytes