Malicious PDF — malware analysis report

Static analysis result for SHA-256 e18bb5a5c61e3580…

MALICIOUS

PDF

92.6 KB Created: 2021-08-19 18:26:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 9781ee7667d07d15eaac5737600410a1 SHA-1: 0819740b8a90d8b91f9e9306fffc60ca5784194f SHA-256: e18bb5a5c61e358003387e23bb7596d6361c355c27a3669a324d8a75a7dbe479
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://philabc.ru/uplcv?utm_term=arkansas+drivers+test+study+guide+2018 PDF link annotation
    • http://kudusde.org/resimler/files/roxupulometifugakivu.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/99972741949.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8a934fe2e---29900771555.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/if41or62mk2bhjr5qa7thak9v2/xedowelusuvapa.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/zutofatodoje.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/d3c9c7055d7808cc829c92c58ab35335/fatikitigug.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/p30o77qcblvfgor47li2hr2fj7/bigisovuwurozuvu.pdfIn PDF document text
    • https://lemanssrl.it/file/juwigowudigitovibajadar.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/92559563846.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bb05de88a2c---jurumug.pdfIn PDF document text
    • http://mateuszkucharski.pl/admin/file/fozuxuxezis.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/84e7c6ea7f4ecea28f2c9afea16a55e3/83299946257.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/dfjgj36je8d7h9k022hebs8klf/gelidotezufakuvu.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160828b32385d7---votejerobabug.pdfIn PDF document text
    • http://www.cbs-emballages.com/upload/file/64873334230.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0da88d49f---51441538765.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/meurs6o8rdfpfk470h8sm1iu12/9055345080.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/20421596341.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/986a9a422944b9fef4f08ece43a754c9/dojoda.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/noziwabed.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077b34dd7783---7371801599.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/166c11c7626abd1d1c50800955b5fe0c/67071580371.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16217891527615.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/91208074812.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/a98527c13d4df774eff4730f1404488c/taxagijuwugowubixozera.pdfIn PDF document text
    • https://lukili.ch/UserFiles/files/96913261021.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_off00010035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10035 18044 bytes
SHA-256: 63436a229a0fb019ad0a72e56eb95a21639b1bc1cfa9abe252ac0ec2ec99c397
font_01_sfnt_off00012fc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC2 11112 bytes
SHA-256: 51ba095efb48ed60390de7fcae9f39479e5638b6f2498c5fa585e3114510248c
font_02_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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