Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cc43188a6ac9da7…

MALICIOUS

PDF

91.5 KB Created: 2021-08-13 08:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 75b6eb5db0a5066977311312a209af31 SHA-1: 12593317ba90b496f158d41bea1a752fb37d19e2 SHA-256: 7cc43188a6ac9da77ac64e23eb08acecb06845890d146550e804fdaa3e7e4e8b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://chinasoftcore.com/userfiles/file///86852206191.pdf In PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ea5187c3f---rowajevuwasilod.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/sawimifazewaraneginuvi.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/nafebipowexiwatimaw.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/ebce8fa8bea774c67f7ee6f9e284f19b/jodipiluvuwuvewota.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/73775060558.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e9175a5932ccb9de36898257967519db/52454798810.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/27580647545.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/69894604317.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/1560701748.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106022c65a---93267591938.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/3357e04cfecda5650a3f1e94a3231fd2/83587374577.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/nkgh3tmiqsvp7f5096arnv2vjr/wefamevepafiwenazozula.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/mexuwe.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/48567218714.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/6ab6c0c8d244fea8704290f76288a342/xisedexevagexebam.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075df479d1ee---2868164523.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fodaguratudidunideputaxun.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/sa7v7fo0p2if2jcsn3clgeeuh3/29497220337.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/65582138949.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v3jav35cc5t8kelpc6lv1ecp1r/9131556416.pdfIn PDF document text
    • http://chinhlytailieuluutru.com/media/ftp/file/komuwoxubagowonoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=examen+de+historia+de+6+grado+tercer+bimestrePDF 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_off0000fcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBD 18652 bytes
SHA-256: 517851b2ecb928ce92740d5813935da3f12875b25a392add0063bc7bab7f1153
font_01_sfnt_off00012c2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14444 11164 bytes
SHA-256: 4194b1d818ef5922d2209d2f6e9675a3442c846353f285f80d09fbb50c1f59bc

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