Malicious PDF — malware analysis report

Static analysis result for SHA-256 32cf6c4f3551a252…

MALICIOUS

PDF

109.2 KB Created: 2021-08-21 11:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e41767e68f117c3392b9f41648c1dea SHA-1: 0ef2161d89b6da19948a94672889009db18cc82e SHA-256: 32cf6c4f3551a2528b0afe4f53c4ebde6d06f3ac1fe70b8bef94bed46c06c5e1
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alexandraharris.com/clients/36054/File/62906245992.pdf In PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a4198eda053f98fb0e1799e41b29fdd4/kiditekowifubifelupubuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cc19c260e---9409589702.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcb13b836f---63231972357.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/6fc588f1e6d3fc69de9f3d1bedd40c59/mawidaxezukumenosam.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/sikejiwudodu.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/mulaxupo.pdfIn PDF document text
    • http://yoron.net/up/files/logol.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/7bkg5fn2cbnd6ajlav3nn9rr29/fumefopatijokirunoraja.pdfIn PDF document text
    • http://geose.ru/userfiles/file/zatapovaxaf.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afd2b8d10e2---32214146657.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/48105650710.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/k0ae85hi19du2rcmku0otlt7m0/wemizigela.pdfIn PDF document text
    • http://santeh.md/img/files/ruloguwo.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5a8b0c1f8f977ed8d7d41b4efb17e294/mebutimakenir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc1408a9af---wibajixelofaronedovali.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rohtdmu2hmuvr4hhkl96c8e3pe/toforuzesanusotikifubage.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c43dd9e50f---85750358134.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d693ad84---kalujijiwizimunelele.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce5997aceb---lefulew.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/59917347417.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/50278935382.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=norma+iec+60439-1+pdfPDF 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_off00014047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14047 11136 bytes
SHA-256: cdbab55207dfdca3a62a4cafe5dec73e88cc45fa727ef7e5b9c6742c29d1918f
font_01_sfnt_off00015a4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A4B 20336 bytes
SHA-256: 381cc3b47dd54eaecd7ad0017384cd569cba969549801b679985e806d0ed1aa7
font_02_sfnt_off00018caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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