Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1c9c09a7be27096…

MALICIOUS

PDF

75.0 KB Created: 2021-09-03 14:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac8f0796393fcc195d8e520dc231dda5 SHA-1: 537e60f8f9c3a4d453462701b069d16c5aeded4e SHA-256: d1c9c09a7be27096b0b41a7f1c8030ee3592672113b16cb824d49503cce7fa3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS upload directories, characteristic of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://asiahijau.com/contents//files/wigexusobeno.pdf In PDF document text
    • https://nnkcreations.com/userfiles/file/83776996307.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/puvozeb.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/udfvm2tve0ro51s2030npjoqm8/99496678024.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/rorosomir.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/pm040atic8hs9feroq3gclbb57/foruwuvapopimotej.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/walagojugijaradajopi.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe14a5b4a---52669234668.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/xupum.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/rakibopid.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/toberexabuzanegono.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/2cbb80f3cc60b5c6f8549448c39198a8/7173585549.pdfIn PDF document text
    • http://whatdwellswithin.com/file/14738854108.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8a6677732dae70512a325d8e38dbc98f/pebigonopopomita.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/961b4e4e7b73bbc2e97cff0208192215/lasegagodoxifaxosevisi.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/51533235403.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/5d20d8b07fab459b85ab1ad761ce6e15/bigulanevekowe.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/94318479955.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/b6efbf548ad1f408b728270bd32dd749/30582876081.pdfIn PDF document text
    • https://fallsplat.se/file/94275905507.pdfIn PDF document text
    • http://funperm.ru/content/file/lasapaminipevubovava.pdfIn PDF document text
    • http://abc-tel.ru/data/File/88025160070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=adding+and+subtracting+rational+algebraic+expressions+with+like+denominators+worksheetPDF 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_off0000bdba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDBA 16880 bytes
SHA-256: c7a7100f0d80f25e7d5bab1d0bee497c007ecdc0097f42999de2d932e3cc0763
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 11460 bytes
SHA-256: d3d2e1200027715722fd80329730b5c1e78387f977dcde5ce180cd361e6caf96
font_02_sfnt_off0001035e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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