Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bdbfd4d2f1e682a…

MALICIOUS

PDF

74.0 KB Created: 2021-09-22 16:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 42c86d4782d954c6b389dc086def7603 SHA-1: b4b482814aba33cfbadc3ccd23fad83a44ada688 SHA-256: 8bdbfd4d2f1e682aaf0a0f82695265ab9c40f4bfd1491940ec39bf09c99825fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to lure victims through search engine optimization or direct phishing. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=sheldon+natenberg+pdf PDF link annotation
    • https://sunkamalzemecilik.com/userfiles/file/dipem.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/189dc33574125dc89e1e7beb6a72890d/gatulewugodudu.pdfIn PDF document text
    • http://naim.naparts.com/images/fck/file/tonomikoxizevosudi.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16135b4ee9bdab---38349823305.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/jagipazufanunixesivejeti.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/22994976999.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140dde0bd724---83031777922.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/27806459262.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/fivebimabewinufubaj.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/mumuwitubol.pdfIn PDF document text
    • http://architettosbaffo.com/userfiles/files/sevibenitedepematun.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/wigasubiziv.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jujawafowu.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/nulegimajuwarelam.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/pupureju.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021092113450752.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/25556192988.pdfIn PDF document text
    • http://alphamarino.kz/images/news/file/kumijopubemokare.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf3551a17---mimalekesokel.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/96809256925.pdfIn PDF document text
    • https://everestart.com/images/stories/file/tebofedufoxelodekidufirax.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613316801aad8---11825852578.pdfIn PDF document text
    • https://tigapilar.com/upload/files/36517797547.pdfIn PDF document text
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/zazoledid.pdfIn PDF document text
    • 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_off0000bf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF10 16676 bytes
SHA-256: c043b5828d7adc55e702c7b5c537780f309173634865406ef89570c1662b4875
font_01_sfnt_off0000ea28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA28 10732 bytes
SHA-256: 527b8bc61d2741840eee6f770365bc820111fa60eff94deade1a53d545940d2f
font_02_sfnt_off00010258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10258 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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