Malicious PDF — malware analysis report

Static analysis result for SHA-256 4511ef728d13262a…

MALICIOUS

PDF

77.5 KB Created: 2021-07-19 02:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bafc929ce4f02bde1a9e3b8afcf0c83 SHA-1: 1bc324ac13e2554f275313297b23a8cf4f3f204c SHA-256: 4511ef728d13262a3577d7d0885941b5f773bf10bf995d70d759be9326137c43
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5478

Heuristics 5

  • 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
  • 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://riolospettacoli.it/filesUploads/file/95963770724.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dea907818627ab2a9cfd4e7b70f895ae/53941354471.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb1f682443---dafiwezojukinadexifubiteg.pdfIn PDF document text
    • http://ckpak.com/fckeditor/userfiles/file/76826225111.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2da07d6b7---23476195952.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/3d2b900cb04c9dc49762f4f89aea8d9b/82468997221.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86fc36768a---roxefili.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/vejos.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/v0j92766nvgnv91cmg3b1t1u1a/99301310269.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074ba3a83576---fedoveroforeniwusilow.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210524201935152.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f967c4eb904cdd1ee31a95dfa67ed874/zudofipirurubigepuluweze.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/11933319641.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fac0aec47c---93184200423.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/xufupopafo.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/avp7np3rjnr2arbitll9l7v7h6/37840711232.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1v9fh4d48c3e4tmlp3c45cb777/vebofonemitadakom.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t1ie0gp10gnb09r2cfqu98l3o3/74393607997.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/b9688ed2db8dbac5f113318b949a3e8c/88506719505.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/l2eu6i0r8cffpg1v0cjuhnuv61/41661120739.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d46bf564136---ditosa.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/1753add2ef7f77c0ae90ee73c5aa5daa/dutawonoxifobonikijenoxot.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16098b52467a94---moruposukewodovo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+make+1+cup+of+heavy+creamPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f11d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11D 10836 bytes
SHA-256: 80cebd5751c373b6b36ac757cb4466fb0bcd3b46fb34eea58c863df7181334c5
font_01_sfnt_off00010a3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3C 17068 bytes
SHA-256: e567bb6ac34808ededa90b3d58e6ea6cce57c98c8573cbe25e1e48008473e939