Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f99d0a056abbc81…

MALICIOUS

PDF

101.3 KB Created: 2021-08-15 22:13:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aab31feb6d298fd67f9861cf53025541 SHA-1: b9dc1e79269a50e690abd3463c1ffecfb2213fa5 SHA-256: 0f99d0a056abbc810a7ca844a699e573a28b7827a85cea74527bfd710b1c50b8
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. ClamAV and ML classifiers strongly indicate malicious intent, likely phishing or malware distribution. The presence of multiple compromised CMS upload links is a high-priority indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • 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://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58fb47646---saxikifuwukavumuzogorawo.pdf
    • http://xaydungphongphu.com/uploads/files/22817887990.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf4675106---ditadotixuwalumafolirenun.pdf
    • http://statsale.com/data/upload/ck/files/noxejefulodelu.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/37630156892.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16094393e66b0e---81348804986.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c47883b670f5fa7035867900a2ca77ad/35732866481.pdf
    • http://ketoanantamhcm.com/uploads/files/ropadusakolefilakewakul.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae328c726---tonagufiz.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6a1t9vorp1j4esilbndhgl05e9/xepumubapijexobumezul.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/29207704399.pdf
    • http://turagent007.ru/userfiles/file/sulogilaguzo.pdf
    • http://sntaviator.ru/ckfinder/userfiles/files/28136228382.pdf
    • https://fresh-cherries.com/ckfinder/userfiles/files/6821234922.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/ff82c79cc30c116fc7dc0f1c14c27967/momolulawuzonivege.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160dc05bb00ae7---jaselisidumozolog.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608298258e3f9---dajavivudares.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb7c11b51f---wuxod.pdf
    • http://bright-inter.com/file_media/file_image/file/59511386342.pdf
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/07d9962b2fef8c5fb21a031491049692/dudijijulunexo.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f5179fc06---sedalizizupagafibefiri.pdf
    • http://musthighschool.mn/ckfinder/userfiles/files/kimox.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=compare+between+commensalism+and+mutualism
    • 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_off000128b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x128B4 16792 bytes
font_01_sfnt_off000140cb.bin
57b14f5508dbae2fdc31b8b7b9572975da9b48a040a483329e61978a1ca661ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x140CB 11032 bytes
font_02_sfnt_off00015a48.bin
50a59f21a372b702eca061a50920020c46a1bc2c4b6943ecef94f0957700f70f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A48 17336 bytes