Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23207d443de0b21…

MALICIOUS

PDF

68.8 KB Created: 2021-09-26 10:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 807dd5bfd7d9c1cf7fe622f73dda117f SHA-1: f0c31b5ca087ea7e2b8f5f0a491d77c33566365d SHA-256: e23207d443de0b21fa0e10f293243dcb258092e9937c21a021d0b54352eab56e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=forms+office+login
    • https://sokolzgierz.pl/web/uploads/files/kewobunulojapebegedafoje.pdf
    • http://ac-kenigsberg.ru/files/file/41107747735.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3a0da00eaa85943fdfd1375a4bc6541d/paduzamavadojus.pdf
    • http://elijasprojekts.lv/files/file/60759471645.pdf
    • https://alkirbilaw.com/userfiles/files/44521797379.pdf
    • http://abwmarlboropike.com/uploads/files/mogaxeli.pdf
    • https://bibonatura.com/ckfinder/userfiles/files/zuzopedoxok.pdf
    • https://pvcmikser.com/upload/files/gorevakuwugupo.pdf
    • http://neteyes.eu/editor_up/rixutomunur.pdf
    • https://n-tlg.com/files/file/1599758089.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613416092656a---62341733402.pdf
    • http://gespk.com/userfiles/file/13143210768.pdf
    • http://pappteam.hu/userfiles/file/87327964339.pdf
    • https://mk-promotions.com/ckfinder/userfiles/files/55398902257.pdf
    • https://dacola.com/upload/files/65269192175.pdf
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/takozijig.pdf
    • https://hurghadalife.net/userfiles/files/17294972796.pdf
    • https://kingdomofgodmn.org/userfiles/files/83828785110.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/45306721900.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613c977c4cc24---lapujuziwebexi.pdf
    • https://kiofruits.com/admin/uploads/files/31466564416.pdf
    • http://maytinhnangdong.com/files/uploads/editor/files/22963662201.pdf
    • http://nakamurasangyou.jp/app/webroot/uploads/files/5856388601.pdf
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/1900808940.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_off0000b11e.bin
7db03f3d5ed7526ff6a53f5040b748222c8eaac6f62a614905177c94c872a25d
pdf-font-stream PDF embedded font (sfnt) at offset 0xB11E 14756 bytes
font_01_sfnt_off0000d5fb.bin
8f7f62b44d3611ee72fa1ec267461ed5c3dab1842e336263791e86788d1bd178
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FB 10396 bytes
font_02_sfnt_off0000ed6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6B 16792 bytes