Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef72925d8f139824…

MALICIOUS

PDF

117.5 KB Created: 2021-09-06 23:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 33b7c6c04951f70d74359f39fdf3b409 SHA-1: c8cf49f0f63e5b40853c483d293584a5c5095169 SHA-256: ef72925d8f139824e48d2d3106778cf3030ba0a94b710bebc099f4919a189fff
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised infrastructure suggests an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086fd6e99a---komidagema.pdf In PDF document text
    • http://viajesalaos.com/webroot/img/files/29291092733.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/7664e97ce239447b634fee51801b998b/57158669185.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/65996851227.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xisevozab.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b8021b9c6---14882966355.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/ff9efd58088f88d30edf0eaa3ceb03cf/54498977606.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud//files/7090873084.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/55e3de262a8c25af2f841ccde8268b58/55216106510.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/gepiz.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609440f857f89---gumufamaluxutolagesome.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/dunegalufuvapijej.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c88605ee12---37097276376.pdfIn PDF document text
    • https://dm288.rs/slicice/file/70230519628.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/32963149343.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160862cfb1b8cb---73668941546.pdfIn PDF document text
    • https://pasarantogel.com/contents//files/jonijafagoru.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9a1cd77d8---bafalavigegebuxuwejoxuzed.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/fomidetirebibetabug.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/xutuwebesiwuditeg.pdfIn PDF document text
    • http://pedraferro.com/files/files/kawamadutifidumerajegiro.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/16794796984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=difference+between+american+accent+and+british+accent+pdfPDF 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_off000160f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160F0 10948 bytes
SHA-256: 9c1478b7e9f252ace19c54a7aa9c8d777338e7fc693f252a7d1b2a4cafca198c
font_01_sfnt_off000179fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179FE 20604 bytes
SHA-256: 869b5b2dcc7048d4eece123384d2bdaf061f498f499a11aaef077d3c2cc7cb0c
font_02_sfnt_off0001afa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AFA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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