Malicious PDF — malware analysis report

Static analysis result for SHA-256 d572e9ed512eb4b2…

MALICIOUS

PDF

86.4 KB Created: 2021-09-14 23:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9227ea0615cfbc50097a7dbc4eae605d SHA-1: 72c52a166b457da0dd66e7b465821754970cec2c SHA-256: d572e9ed512eb4b2b5d41bbc208b0bfdc35b0b2efd1aa6cbc35a03e875412cb7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://qbcar.ru/ckfinder/userfiles/files/nesofumebidepekolakizi.pdf
    • http://sva-jeanroze.com/xmedia/file/febumesojowedij.pdf
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/37471632861.pdf
    • http://viorina-deko.com/images/file/setug.pdf
    • http://marketingnews.fr/images/file/kabazat.pdf
    • http://heibldr.hu/FCKfeltoltott/file/votavibad.pdf
    • https://fentesmakina.com/paket/upload/files/pebolurapusiporez.pdf
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/89623111557.pdf
    • http://aotwcasino.com/ckfinder/userfiles/files/91425097568.pdf
    • http://dmhu.eu/uploads/uplib/file/sogovafavobuduromok.pdf
    • http://futurepoolandspa.com/ckfinder/userfiles/files/46704879956.pdf
    • https://baglab.pl/galeria/file/75413991950.pdf
    • http://fazekaskozpont.hu/images/upload/file/lobarelakutap.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133657a2eb59---buvafeminifedetadovubav.pdf
    • http://frutapac.es/ckfinder/userfiles/files/dakitesutaniv.pdf
    • http://thaide.org/userfiles/file/zatesogadixobo.pdf
    • http://jubileejec.com/userfiles/files/zuwowejodedajas.pdf
    • http://www.propper-droppers.nl/files/file/71745881768.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/f97fee7b4ff8eeecc171b4d0fdb3a145/54264419837.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b637cf1a52---16290260233.pdf
    • http://beverly.kopanramen.com/uploads/files/suvuwosisezozizaguwarezuf.pdf
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/73789442560.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac4c05c84---mojuvufinajasol.pdf
    • https://barrierball.cl/ckfinder/userfiles/files/91934652853.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/95d4d227f5dc6fa56489ee859613e1dd/sijulamubogejo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=rom+for+redmi+9
    • 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_off0000e4ab.bin
aa932455ddc7375d42a22b7102291f60f51c48516f329d2cde972396a7901f35
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 21264 bytes
font_01_sfnt_off00011d3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3F 16792 bytes
font_02_sfnt_off00013556.bin
6e42334544e42d3963afc54228efbc51219fa1ba63e3642090cb2b5c44eba6b0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13556 10148 bytes