Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd4dba9af6dd6d4b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 07:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: ac5fe19d64e80b30d172d24f7969b8b5 SHA-1: f2b3db61663b66b8d7d5812352b742b48796d290 SHA-256: cd4dba9af6dd6d4b255968bddd3e675ccad69eaedf560294bb89abbb532ba2b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which point to compromised WordPress sites or use disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit vulnerabilities. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://danielfelber.ch/userfiles/file/56025451165.pdf In PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/sawagu.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/27378407147.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/jeniwejefobe.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446d68d6918---56988521453.pdfIn PDF document text
    • https://soechi.net/userfiles/file/wexujupipolisuza.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/82716887990.pdfIn PDF document text
    • https://onecre.com/images/content/files/87298143653.pdfIn PDF document text
    • https://pellevah.com/upload/files/52667344397.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/53215007104.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/rozepixafadogejufebalolej.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/8599383139.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/timupesojavo.pdfIn PDF document text
    • http://hidropro.hu/upload/natufosevumufudiw.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jimewutojapevibitor.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/23359830308.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16146b0ab450ba---mumajurimagulokotoruga.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/tuvutifesetagezotanakilod.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/nolabusikejiti.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/pafapulonajasamipaz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c11f82dea7ff5ccdb19f3f87f1fe6b51/23538648285.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/74731189828.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/bagabosomajoban.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/b6qhl64batt3cti6iohgu1h6ic/viwirofebulelojutiluf.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/jadudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=download+thop+tv+windowsPDF 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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 16524 bytes
SHA-256: 3a1d3f3fb865cb4176764be2544f59ea77cac4d7ed2bbfd6d11546a1b8eb5115
font_01_sfnt_off0001008a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 10408 bytes
SHA-256: a7d068ca94a081f13fd6be5f11839b07fd042ece41dd948a39aad4556950cf67

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