Malicious PDF — malware analysis report

Static analysis result for SHA-256 56fa69c9b7540361…

MALICIOUS

PDF

96.0 KB Created: 2021-10-17 17:34:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0fe1c1d5a573ca76dfdd86b92182765c SHA-1: bf5a78bb194581c573298d0c3d2b5520481b94af SHA-256: 56fa69c9b75403614685d63ecd83334262e3854979f6aaa6b0915de40ccc5676
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be acting as a link farm to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/9177062d7701da53510fd9f8ffe1b0cd/wuwokuxerenub.pdf In PDF document text
    • https://familienbilstrup.dk/userfiles/file/32074405124.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/dosivunidodofoborudedew.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614482073a56e---gikemul.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/mavofidefuzit.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/5731623967.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/86869024045.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613155db26018---50822049702.pdfIn PDF document text
    • http://pk.mo/userfiles/file/luforowepu.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/9043311840.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/rilapojojolupoxuwinub.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/jutalulabano.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/lisonitukeka.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/92613565620.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158c106b993d---fusokedidofurimufatimi.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/koxifijoxutenutelotewujab.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/dixogadofip.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210904194839_esbnot.pdfIn PDF document text
    • http://mopron.ru/upload/files/papovisazefudanoxuvu.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/tizexujofisuji.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/56852024023.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nazonafepogamobidawuboj.pdfIn PDF document text
    • https://rafaela-motores.com/userfiles/file/17550107401.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=is+will+a+helping+verbPDF 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_off00010e9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9A 10556 bytes
SHA-256: 04ac017b9f7f79b93f1bbaa266fc065d0fe27d78bee948ffedd84d1d2de86acb
font_01_sfnt_off00012663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12663 20180 bytes
SHA-256: f510fa8ef331f3446db3ac2e95977dbb09593477a9e27be352836712716adc49
font_02_sfnt_off00015a75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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