Malicious PDF — malware analysis report

Static analysis result for SHA-256 28060e66d0a86baf…

MALICIOUS

PDF

86.6 KB Created: 2021-09-07 13:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dec855d70d78585b3ed11a13ed7ee0a8 SHA-1: 79828cad6b4bb04fbce4e5b7fa51e076cda482f6 SHA-256: 28060e66d0a86baf3d6cdafd47273611fad78d809be90f036b3cfa9072002e19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/39b825d591aea1b29f4b09f6eed3dc30/14194653155.pdf In PDF document text
    • https://isabellepieman.com/userfiles/file/39801482206.pdfIn PDF document text
    • http://kappp.ru/js/ckfinder/userfiles/files/53870084388.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/fidukozitubulozuteruvisos.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087436fd3e7b---2592156294.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210807040902.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160828daf2cdeb---kibovuba.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/41736661552.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b56e032c98---54231919181.pdfIn PDF document text
    • https://caror.hu/ckfinder/userfiles/files/lizonadorudeb.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/rijilalan.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c461e9384b9---24391408668.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/68982450696.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160724abe339b4---28993130420.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/21260441170.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/22664191915.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/miwus.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/donewarekewoxudijali.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/zutevotivu.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/10m54mn7m6m2gbigt8r0gbq6n0/6615285136.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/lasug.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/eu9brkc6gpimkgup30sa2fnt63/15051545665.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e87749322---zurilimupewadowafil.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/60240023914.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=timoshenko+strength+of+materials+solutions+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_off0000e7d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE5 19268 bytes
SHA-256: 39c0158ab9b29daddc96cd9effcdc622c54c34584b780b5f85d9bcd308723ddf
font_02_sfnt_off000132b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132B6 11100 bytes
SHA-256: 97c0821fadfad0c3e2d33fe3d17c13dd17be5a47eab67915d73545d4183efa84

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