Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db6159a46abfa20…

MALICIOUS

PDF

85.7 KB Created: 2021-07-25 04:45:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3c6f02b69b2c18f547f83edee44845e8 SHA-1: 130ceec5e3b774fac192596b0f183b05bac91742 SHA-256: 5db6159a46abfa20c5091d9979a3b2c2d5dd45d34ec13e5f2565fcd9588cca48
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous external URIs and the link farm structure are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://mytopics.it/uploads/file/wovovojafemumi.pdf In PDF document text
    • https://murderescape.com/wp-content/plugins/super-forms/uploads/php/files/9c3fb592158381e09329400d0e012223/gezemalat.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160fcb4c948d16---wekof.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/lowejipotobafaf.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/782f54bfa2fda0789965b2cdbbce958c/nijulinuzevi.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8e57e88eb---fomezexigajawadidewelab.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/kutivazokolanola.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/pewawarapa.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087076d3c1a2---wiwifegufumepulokorilip.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/2berlhj8omhudbd3h20mqbe6i8/sobobupusodor.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/femosubebuk.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/tivitamavebasomowasopo.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/84b0fb797afbf7415f8f69cba4116085/gabilodumexo.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87e27f038---jelaxe.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b046b6a9937---kimifopigumakomisotag.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1c459e7a02fd3e55c15937dcaebba4de/natixofubegirekowuwojamam.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774102dbc6a---62655492501.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/bagedefiv.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/eb33ce64d61398212934d351ca670c9a/11301456556.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/84567708663.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/zanobag.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/21915233550.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/90626871965.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=maternity+leave+application+mail+formatPDF 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_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16728 bytes
SHA-256: 5b770ea30e965d49daf70945a1180b2d0c498420742855db2b09f00d59e814ff
font_01_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 10644 bytes
SHA-256: 7603a9bf711b19ff78048fe845c8337357b349e609fbae61439e7b5b0755fb80
font_02_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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