Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac9ff44bd488ec6…

MALICIOUS

PDF

90.0 KB Created: 2021-06-26 01:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a23896f039fa46733a92eb682634037c SHA-1: d7efdda1962681b1ba0f8abd08af273b3d6bb1d9 SHA-256: aac9ff44bd488ec669b947a0a6930c88767c304127fcd268dca33d113ebdbfda
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the document structure and URL analysis are sufficient to infer the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://africanhairbraidingsalon.com/userfiles/file/18621340680.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cbb3c62b2---logaronuwanemadegaza.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bfa98eba8---jukajamaz.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b519870a43---jinokidogemuxejejo.pdf
    • http://acecaalcoy.com/userfiles/file/mimukex.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/4289009629.pdf
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a894bc0855f---5152251405.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/7cc11d492deda69eef8e09acb7dea5fc/8929596019.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fcb5db875c---10906296892.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//83195755939.pdf
    • https://davaocarrental.com/images/file/95735063117.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ba54744f2---36415302632.pdf
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/62003236976.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/346c26936dd1f20a18d3272f87ba8c4a/34200845660.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779d6c99b04---nivumuvolobovinaxabubut.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22fb42bae---lumavapavetisigelaf.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc225b8e7---kepirubakorozusobubipen.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/67101504462.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095ef4dc3fd2---wirawidotadil.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078c4423464f---salos.pdf
    • http://eau-msu.ru/ckfinder/userfiles/files/26609130727.pdf
    • http://jfkanacon.org/data/userfiles/files/25638262751.pdf
    • http://riggi.ru/userfiles/file/putegisige.pdf
    • http://aklond.com/UploadFilesfile///2021050414112814.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=good+describing+words+that+start+with+t
    • 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_off0000fb2e.bin
28eae7d04d8d470fd3ca1132b34bb0396b76d3c9a6323e95c76e3b3967b3209d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 10868 bytes
font_01_sfnt_off00011419.bin
87076a339b17296a530e5c6f21a688406d2284ffda3229a2a987300bde88906a
pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 17212 bytes
font_02_sfnt_off000140d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x140D1 16792 bytes