Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef22fc6c38feb3a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 16:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a265bdbb756a73f3f153bbcfac563f7b SHA-1: 5d0c2f844ab7391996919461e81363158782d158 SHA-256: eef22fc6c38feb3aa49d3fc9db590c71dcf33b8b534620f7679c530033c3c315
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards a spearphishing attachment vector, potentially leading to client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://alaqart.atelierleuthold.ch/userfiles/files/fixila.pdf In PDF document text
    • https://rimi.sk/userfiles/file/83306951499.pdfIn PDF document text
    • http://termocity.by/pics/files/tavisexolekenu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/21398013094.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/86345456987.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/86996512827.pdfIn PDF document text
    • http://nmways.com/uploads/fckupload/file/38339245866.pdfIn PDF document text
    • http://vino-charlie.cz/userfiles/file/40267726570.pdfIn PDF document text
    • http://storemisr.com/uploads/files/fivibujekimoso.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6f4e0956---vebunuvodewebudixajujawu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613760b9a6bc7---58361516755.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109032202594769.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/25693586922.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6489d489---87510961759.pdfIn PDF document text
    • https://fix2go.info/userfiles/file/92697676532.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/34368726988.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/lumilopilad.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/nokopapunopaletibum.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/3145474010.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/39503140475.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/34480513683.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/puwafipotozapalewaz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a71ccda0a---69694734768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=robux+generator+real+workingPDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10680 bytes
SHA-256: 05164510a8181787fdcb2bb9feb355edf1e948b61bad7db6c16878f0ce5e4259
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 16828 bytes
SHA-256: 522f7ff265cab3fa8e000930f4ca7981d9d19d13328c2f23654087dd002ecb35