Malicious PDF — malware analysis report

Static analysis result for SHA-256 4085cc48bdd998c1…

MALICIOUS

PDF

99.1 KB Created: 2021-07-25 09:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6d25f42062b771204690a470432410b0 SHA-1: 0b6f451f6edb7e7dc84dea98beb87dcd8fbfcc2b SHA-256: 4085cc48bdd998c1b70a400f23e087e42a0733787077df9b0780ffe29b2d1134
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://master.plus/wp-content/plugins/super-forms/uploads/php/files/afbb61325253790a50d8faaaec76c8d9/miwus.pdf In PDF document text
    • http://jullien38.com/ressource/site-image/files/55791443758.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/10721499440.pdfIn PDF document text
    • http://regmac.net/userfiles/files/42944197770.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/osv275dd1l0ucaobklb2cg3l9m/20169807258.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/duwosevaberox.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/94fbb1ed81b03fab74b463af501eb57b/bodewab.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/5dg9ue93v14oqh0deo63e98os3/67362274100.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/i3cbe6o2uvpb9g3o0qst3citge8oaso2/jitinabaxobiredijusuz.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e5067fdc9---87037182989.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab75526fd3e---36747335302.pdfIn PDF document text
    • http://waltwhitman1964grads.com/clients/6/6c/6c9ae932573016e5ff31759a10dce4b4/File/tisabokorizubawutobor.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/94473941537.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/lunakoso.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/27f7c329a10daaf62cfffb3b5e964aac/74974691455.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abbe9b14a15---76756636564.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e2952c57e---47746097457.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17378926471.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/vepifalujuker.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30e7276ed---pokuvipilinixijigusivix.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/6u617kphnrurpr55vf6q9g0559/3369198778.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/95858867262.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/89t3s1pn3qq6c68qtgfgqb1it0/xekavewawenivaj.pdfIn PDF document text
    • http://veterani-pushkino.ru/userfiles/files/guxawibit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cheat+codes+for+shell+shockers+2020+pcPDF 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_off00011c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C31 10888 bytes
SHA-256: 7ffc5baca41b56a057d07739cd9ff543c989c266527815df1b0fcef5c4bc4cbf
font_01_sfnt_off0001359d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DAF 18184 bytes
SHA-256: 4f60f6f279dc9d625253cb86830f9f95daa3f7b35a442b9a4e1820e764af8161

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