Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9195da3c99bb5f…

MALICIOUS

PDF

91.2 KB Created: 2021-07-13 21:07:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94a072e055c8c041a3683b3c463a907d SHA-1: 88942980dbf1ec0eadfc187fa4e5498ffae2ec6b SHA-256: de9195da3c99bb5fb6ecffb799471bb2c40dff6be9902490662d116f955a8268
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://oniceh.ru/uplcv?utm_term=calculating+lost+labor+productivity+in+construction+claims+pdf PDF link annotation
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/rdb1g5vveafhkdtroccchsi699/58312147686.pdfIn PDF document text
    • http://best-infosystems.com/userfiles/file/xuxuzuwukomot.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b0adef1e9082f3b94b2494cfcd0a9548/11910507570.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/83137568888.pdfIn PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/80538754948.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/pulijopoliraserox.pdfIn PDF document text
    • http://goref.ru/files/file/80430926324.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/xuwavenezojimumag.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/wozibafof.pdfIn PDF document text
    • http://blueyee.com/upload/file/221257416640.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af3bb96496---57371276456.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/vemevujafimebavafubenoxa.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/32853778140.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a4994c369---47286444900.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/f9qokt89nl8429r5tks6v619m4/jifazizoxugupa.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/87f9ed86544b79a205216b9b604b633a/75905344094.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b434be6be---pubomolov.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/c0e1f6ab6f3ae0d093af3aae52296c76/4360919904.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088efbad3930---balejeka.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/28353d184ac7fbdc1a201d34e12ca2e6/47278490691.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/neximawibixivebikul.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/22037789316.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd16ded8587---zugesimatulizojof.pdfIn PDF document text
    • http://bdn10.cz/files/file/kubunobometisexime.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF78 16712 bytes
SHA-256: dbed25343bf337bf5d4485defbab09cece6ce033263d605fbe0c48c5e58849da
font_01_sfnt_off00012ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB3 11280 bytes
SHA-256: 6d6838c1979bb67e13fad4ff630a3a17bfb6f4ccfb5f00b87153cebe7e8c5449
font_02_sfnt_off000144d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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