Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e2566c8002dc5dc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-06 08:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8815632b2ee2697e4e1a552a154e1b3 SHA-1: 302554e7c17a999fdd047f27b74597044668909c SHA-256: 8e2566c8002dc5dce546b14fcd111590d303e87b5a24ef84bafa52b2b8fd6a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, likely intended to redirect users to malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/40d42d672b0afcc446930c31c00b8fe5/9475873627.pdf In PDF document text
    • http://harissarantis.com/userfiles/files/35809384038.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820816ca5ba---tobuniburajezukuxab.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/29838390176.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/joferexebaposafafikajo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-31/20210531043811546541.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/3e1d30bbfespn5tqfab37g19sj/guvaneloxol.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4c3594a87---95278916493.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/nesiverifup.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/31403142680.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161141e919054b---meximilugu.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mugb84n0ln7o5i3873ekm0c750/monisegedu.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/duzusixanabimimejepadapev.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c2a1d344---mifodimo.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/miluwumowimu.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/30941158660.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e10ec1008---64364876114.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087b4d694a19---24218749854.pdfIn PDF document text
    • https://mimpiindah88.com/contents//files/19498211948.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/zatisulenowe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/40805212615.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/714a38efbaf5ecd684b86df89ebffc11/7513129748.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/febuvokaramapirafisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=2009+pontiac+vibe+awd+owners+manualPDF 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_off0000ba57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA57 16524 bytes
SHA-256: ed291c1a38e38091b011c96e43e3baf7ed3e932d8a6aa2f888b9edce67faa9db
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 11380 bytes
SHA-256: 980a4d8f4b175c2638ac85466a25b92199370ca9a8f78525acf34742e63db35e
font_02_sfnt_off0000ff87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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