Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa436e0ccb7c80bd…

MALICIOUS

PDF

100.4 KB Created: 2021-06-30 07:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c4b7cd9cdaa206b21882568835d45321 SHA-1: 9efdafe75d76f815cfd3aba62a349256034c9d47 SHA-256: fa436e0ccb7c80bd9da1d2d820cc24c96e711ae63cc2d422e55fad4ad209a50b
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content or phishing sites, leveraging the compromised CMS upload functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9872

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://synerhu.ru/uplcv?utm_term=type+of+pollination+in+hibiscus PDF link annotation
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e016c94---244957810.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/e348bf5ac3f4953b57a6f89d872cd3cf/88115723033.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4e2e2ff12a3fa7c8ae24c738e88e126b/wofosizarem.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/01v15h1fd5mnugpfcs3okam0el/giporo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/wolikeda.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/budijorovi.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65c5bec26---48811906327.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbcced6f49---7717445655.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/8ade151fc056a03e6e8043f74797a7be/mipedejilega.pdfIn PDF document text
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/5var79lp9jbnh0cd0r27i5u8fv/xirijudukes.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/87788589530.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa17d5654---tiwejonitabute.pdfIn PDF document text
    • http://humanlitech.com/files/files/setosoruxowiripepa.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/39277963204.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/71931273339.pdfIn PDF document text
    • https://tavio.ru/files/file/39977649848.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723096ef3f6---tevetilonimalidumive.pdfIn PDF document text
    • http://pvhs1967.com/clients/a/aa/aa78cb05297cd93d8a9ab6bd1eb8a3c4/File/kegevixuxarir.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a61aa7b1f2---xiworekifuwukugake.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b06416a9ae---xozejigulozituxofil.pdfIn PDF document text
    • http://citysuji.com/ckfinder/userfiles/files/76265217795.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/58386849489.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/e2f5214497718840d2384d1839f8689d/vazilatixepujer.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/e44428492ea4427fe7b8bccc4d48412b/39389308002.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00013931.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13931 17660 bytes
SHA-256: 5c8d12106eca934428b37d1d68c1275905a50cc9786081e90aa88717b4ccf9ef
font_00_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 10796 bytes
SHA-256: c20bdf38cdff85fa0cf032f057fd48187a12107597944428a02f5ca711fa4708
font_01_sfnt_off00012120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000153e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E6 18136 bytes
SHA-256: 2f628d21d8949990328162e502252b6a71b89ef72a2751655ab242738b898532

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