Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd3ab0711fcbfcb…

MALICIOUS

PDF

72.6 KB Created: 2021-09-24 22:35:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4e5d095b9b3522fa4f2b946ac23a907 SHA-1: 85b590ebf386768eaa96b1bb07e65a6889511a47 SHA-256: cbd3ab0711fcbfcb24ba424b5d793e7766e6221a634a61cdaad25fd68e266c4a
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this assessment, suggesting the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://heureka-cz.eu/files/pozexebewonibagudowuwod.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/xiginaxukomuvamipezuk.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/60870747870.pdfIn PDF document text
    • https://renault-service.com/userfiles/vutovixixajuwogidekiki.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/pitemibesaponixi.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/99696783024.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/47542171455.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/ridor.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/83163313265.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cc1a2c9e94---29614868933.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/dawikuludederow.pdfIn PDF document text
    • https://stormester.no/files/file/22083438149.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/bakelogamobopovovofepo.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/rujejivonifoba.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161452bda1076d---nodafonebonejixugut.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/62687740339.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0430ab4bd---45363379322.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/69875908847.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/77412497481.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/fijapajitofaxunap.pdfIn PDF document text
    • http://levotst.com/uploads/files/4353036093.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/4399785906.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/15145276098.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/jevuridibetonakud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=turn+off+chat+heads+for+text+messages+androidPDF 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_off0000b43a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43A 18576 bytes
SHA-256: 277e450ef3f2b0d588d3c012e9b20e8d54555a28e097ded007e45665f6f978c6
font_01_sfnt_off0000e2fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FB 11040 bytes
SHA-256: 981831d316f5cf80a41319dc08108b58a565cf83ce0cd3e579c5790edff074dd
font_02_sfnt_off0000fc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.