Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0860e8a216b67e…

MALICIOUS

PDF

98.5 KB Created: 2021-07-26 19:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bb1740dd7cd6b2bc464179cba3fe16cf SHA-1: 643f6c53d6af60478f8600b9a004c667848cefcc SHA-256: bd0860e8a216b67e75e543b6b4cad5625cd052baf6cc545ccbd2ac3af7f37027
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, a common technique for distributing malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the structure and URL patterns suggest it's designed to lure users into clicking through to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://lawngo.net/fckfiles/56027798463.pdf In PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2dtjvdv7miu9lvvfnctgr5c6rr/nafofapujedidezenafatej.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fcf974e1218---58752038645.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/646eb2d38aaec125ab0ece388cc07544/lepexabimitudax.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbbd7c2fad---17610818244.pdfIn PDF document text
    • http://kccmaul.com/files/files/90097768863.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/1lrc5dbfl9dncip68mruva58s4/39622062240.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/73f999bdde243db9340845d6388e4270/taluxiporikoxelipu.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/53034260035.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f6339ab69---gewurezazosedetufi.pdfIn PDF document text
    • http://juentai.com/userfiles/files/kefiniworadimiruwu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16084cc10031fb---kosegapijotawisirogavu.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca8661f627---fuditino.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/23veub3a7969dd0f3oga50hbrt/18634884656.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/22904108470.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070e1503979b---boxigirexenejopokazir.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160fe48829e57f---jezet.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b10b52a0dc8---77590587966.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160913fb3edaef---toxuxenererinidojubowafa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfda3c1017---karovi.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/7162288193.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f86324cbcd---putono.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd09f2cee---451184396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=usa+soccer+goal+leadersPDF 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_off0001200d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200D 16760 bytes
SHA-256: 8738cd7804eb31370175461a345b28815ab2de2515edab4533f8e6279d1a23b8
font_01_sfnt_off00014b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16397 10260 bytes
SHA-256: c066c1f78e8b4523e3b00d7d9238cdb282daa7ca8c67d232724d86c4e8f1ce5a

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