Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b880b7ab89c793…

MALICIOUS

PDF

83.0 KB Created: 2021-09-06 17:26:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f30d2cb8a8abe9d71d069e61c9e79758 SHA-1: d485015cc4325388e9a44546f14f51008cffbe28 SHA-256: e3b880b7ab89c793ab129cc726c0d366a913665fbad9790cebf1bd6e94ea4977
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect the user to malicious content, potentially exploiting vulnerabilities or delivering further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/1j0ollvc3ce18fmh38aje16ujb/83434189791.pdf
    • http://aldo-ins.com/userfiles/file/fotepeloduw.pdf
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/81520753146.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/59009dfbca2d5dd1a0fe4c6ab67f4f4b/samoriverarewomuxitib.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ad71d5399---kuvarexonefusuvevufopeje.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/55b81d2ff562495b60303784d47690f1/xoxelimisapogupelex.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/cb952026d436cb1ca4cd10e4731c3891/40518038409.pdf
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/75884851921.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bad4026ab2645f9da50b5b442e56be7a/vufezo.pdf
    • https://stijsr.com/userfiles/file/48333468223.pdf
    • http://sumbulefendiegitimvakfi.com/resimler/files/87293975927.pdf
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d150289c42---60242694320.pdf
    • http://test888.org/uploads/productsfiles/20210702035714_7e9b8.pdf
    • http://axiomestates.com/userfiles/file/guvodivanuwibesos.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/483df7d16a9bf70c2be7529d649202cb/dibekibepenoxoziruj.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f0d44b09---98523137255.pdf
    • https://rts-wm.com/ckfinder/userfiles/files/nuwej.pdf
    • https://mlspoland.co/files/file/93853557532.pdf
    • http://fatfailogistics.com/fckeditor/files/file/63206360313.pdf
    • http://files.ibiza-ferien.de/file/nedajenavebakapaposuta.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/20592151389.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/97138622068.pdf
    • http://cuatro-pr.org/sites/default/files/file/42498398999.pdf
    • http://spharma.ua/files/file/44697423462.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hipaa+form+pdf+florida
    • 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_off0000e171.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE171 16792 bytes
font_01_sfnt_off0000f983.bin
29120bea4ad0180faed85e231951d933ae010857a31ec06f657ec02e7dc82fd1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 17924 bytes
font_02_sfnt_off0001280a.bin
fb002a8c3ebad37c2df7bfcf5f9d9c77a5c3788299b9c108f8dd63d64f3c8e14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1280A 10148 bytes