Malicious PDF — malware analysis report

Static analysis result for SHA-256 742ef031c9391929…

MALICIOUS

PDF

71.8 KB Created: 2021-09-06 21:35:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cdbca731fb1eac907631589c05fdf598 SHA-1: aa9500425f152797a3ea924573fe86b926a83e60 SHA-256: 742ef031c9391929dcd94450410e30ad0baeb626cfffefcb18119815f2f91e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm, indicating it's designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=national+health+insurance+in+south+africa+pdf PDF link annotation
    • http://naturallabs.fr/userfiles/file/taxupalexofodiwefukazi.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/78198790440.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/04b3963d9594e40b05c96d7f5ac72c38/29356577230.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973c1580a79---redenudosaruvubo.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d22922b4bd---33532905918.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/pevewejukasinakix.pdfIn PDF document text
    • https://mfdesign.hu/files/file/setamanajuwidiwixofubi.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/besusuro.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/7c51b9b65529c6d3880c4903e6ea1366/33821281953.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/tanodoguwuluven.pdfIn PDF document text
    • https://cheesykeju.com/contents//files/48592914768.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/4543afef8c9039c0c6adb15af9790ecd/fiwufajesozubapofubo.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f461597870214de237783aaceb38d37/9893877681.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/gufademasudowibedebataje.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a207985268f---80439497913.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f305168857b---52109235975.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/0b8e026cf776509686f764338dee01de/fosibera.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/48768884300.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/12969617571.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36640211081.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/xozagukejokupotijixepuv.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/90462281274.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/dee1c59edd232f2f161287b35824a554/pubegoxi.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a7bae18be---kazukujel.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_off0000b836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB836 15840 bytes
SHA-256: 10e145d8ea9c3557f430c19b0d88abc4e8af55cff0d4490475cb4938335cfd4a
font_01_sfnt_off0000e041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE041 10796 bytes
SHA-256: 62634c6270b562eab1eadbf8bc63182a50b4762ede10703e40c92f22a6a0505a
font_02_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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