Malicious PDF — malware analysis report

Static analysis result for SHA-256 5454a0843d112778…

MALICIOUS

PDF

94.5 KB Created: 2021-07-27 12:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9401ec39825dedccf4de7c1abcc5c88 SHA-1: 270b6681bab70b9d9442e97f9ea4fa715ebefed7 SHA-256: 5454a0843d1127782c04c2a1b90d9dfbb3e96c56d555839e7429812ed8a46dd2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised WordPress upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca171488a---fadevigafudalukufewat.pdf In PDF document text
    • https://italvaping.com/file/rupibipasekuvumelexasum.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b70ca1983a1---benumazuvedoduverogila.pdfIn PDF document text
    • https://wecareprogram.org/images/file/mudixikikifu.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/ab662565379f6ad7994a9b68fc688ec9/38890629455.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/95829730243.pdfIn PDF document text
    • http://pcwest1980.com/clients/9/9b/9b13e9c1eb96aaf026ead536bb80a376/File/57741222574.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/65378863188.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/zijeteziwomuxomemufira.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a92e6913ba---26026542639.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/lalimuzitijo.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/xupudejo.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/57261840158.pdfIn PDF document text
    • http://dnepropress.net/files/file/57726450652.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/59574208660.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/likuzulanaxizuvijabu.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210529_6BC855D9A79E7D5E.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/juxifewapiruwegawabege.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210707_C26C2BDBAB78C925.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607982deb9710---41861030369.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/nipizaxemon.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3a5040cc---90159303167.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/26169791583.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf5322cf1---73372079820.pdfIn PDF document text
    • http://geobrofab.com/clients/d/da/da7cd3953015cd63472398095fc1fcdd/File/35068578300.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/809147cee5c4b1a86652248e6527182e/4497255651.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/17bj1krd5iq3iodpg8198eua71/33612971010.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/67a0c7d7c6d42fcc625929e0ce074af5/64995845362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=fnaf+world+update+2+download+free+full+versionPDF 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_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10840 bytes
SHA-256: eba58a6cc7e9398ff23bd60198dd2729f328397e9fd0ddb6aede3182ddd56bbf
font_01_sfnt_off000120ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AB 19932 bytes
SHA-256: b214c1cc9c0753e0e87c55ce6b9f900ee6622987b0f8c9f1daea21c1a10ae2b6
font_02_sfnt_off000151c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1