Malicious PDF — malware analysis report

Static analysis result for SHA-256 9766a9c1edbd92b8…

MALICIOUS

PDF

65.0 KB Created: 2021-06-22 14:42:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: dd78b421e03618021dce1614d6779e83 SHA-1: bcac7b6b408e345b9388b4badcd200cdbb6b491e SHA-256: 9766a9c1edbd92b832db587b0cf6c75377499c0d880c6da673562d4e0b5cebdd
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://geostudio.eu/userfiles/files/50825620793.pdf In PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e376c7950---42921106659.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07f293caca---88307564530.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/19781524713.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/valinabopadabix.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lemowefi.pdfIn PDF document text
    • http://cutskytools.com/d/files/89756717719.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wuwiji.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca44423dea---24117221411.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/22406775628.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file/%5C/dejikozemaker.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c780bf742b7---zagagujesuxusolazusegatuf.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/xitiwazoxozurexuxubajomet.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6ce5ca1d---kidenanoleb.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/8atgh81ugri624fihnom5ppja1/17810423549.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/112638c021e66872eaa8a4d2a779992b/dawiwovobonixalamunug.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=lowest+common+multiple+of+18+and+21PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC079 5616 bytes
SHA-256: 0caad2abb5decc95091134a3541f767a6069e71bf129145b0cb6b8d52f1e728b
font_01_sfnt_off0000d3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A0 10344 bytes
SHA-256: 83d977812fa5a5ee88617101f0114f870f0cddd0d0ecaed9a496635dc7191093

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