Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50b4023b3142eaf…

MALICIOUS

PDF

86.4 KB Created: 2021-09-04 03:09:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13186b35c0a530662c8af445e3fbe337 SHA-1: 17f7a33ef9321f666723a41c23e6800132c359e8 SHA-256: e50b4023b3142eaf42b5a40072495c1300c784bcaca24c25f500113381e0a3a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs that point to compromised websites, likely intended to lure users into downloading further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. The numerous links to WordPress upload directories suggest a common method for hosting malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=plan+orlyval+pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2bc73b842---70902167770.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c62d7f214765f315cae09dc1ab7fea7c/gepesaxizagerunuk.pdf
    • http://aqbnb.com/uploadfile/file/viburonagerabuke.pdf
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/o5hau189u9ou5a558vpn43dls2/gabemabixizupukosaseragu.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ad9a005f2---39453982335.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e9309e0f---pexegurawigotas.pdf
    • http://giaydantuongphongngudep.com/images/news/file/mukakepow.pdf
    • http://oris-am.com/editor_up/rawukogelamotimotinasuku.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/21a1798b61e78452716948191383fe28/nabovezegilufojefuj.pdf
    • http://toonesk.com/upload/67336856388.pdf
    • http://cobmedia.hu/include/61340580793.pdf
    • http://espacioschillout.es/images/admin/file/7586230168.pdf
    • http://nail-free.com/ckfinder/userfiles/files/98203091672.pdf
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bulanipexukajotelexa.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a388344d464---55250818180.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a7bda0a67---figaliregur.pdf
    • https://mintowncoffee.net/uploads/images/files/rulagopepenuvefosuvoroxo.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/8cf0fa3b74f3241f81e3bd53654be9d7/38635807791.pdf
    • http://kolaykanal.com/userfiles/files/11823226049.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607016fd5deba---80215801526.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/j0kfcj1tuvb2ujb47hbg85oood/zarijol.pdf
    • http://gospelpour100voix.com/fichiers/newsletter/file/54701805595.pdf
    • https://anukulagrotech.com/userfiles/file/kavifanazarapawivekab.pdf
    • https://przyklejki.pl/userfiles/wikaboliguwirivixulakexil.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_off0000e3d6.bin
8b04739404ad702977aafb321097355619282154aa7995f20de0caef0041e9b7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D6 21620 bytes
font_01_sfnt_off00011cf0.bin
739872a4917579527526e2cfa5d70591f4f172bd7a03cf0821ff3bee3ddfced3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF0 10180 bytes
font_02_sfnt_off000133dd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x133DD 16792 bytes