Malicious PDF — malware analysis report

Static analysis result for SHA-256 510798d698df718e…

MALICIOUS

PDF

72.6 KB Created: 2021-10-10 07:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 35e7b1e499d80eb291b53700af748434 SHA-1: 2d3c4b1d7f2a15baac4b4ef642e4718bb7a85e15 SHA-256: 510798d698df718e8ffedc9500e99eb1debcc27a52420b61f6012eec0f9e2b34
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or compromised, as indicated by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or directing users to malicious content. No scripts were extracted, but the structure itself is designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=example+of+structure+of+academic+text PDF link annotation
    • http://dom-2000.ru/ckfinder/userfiles/files/38400691152.pdfIn PDF document text
    • https://biocenfis.es/uploads/assets/file/lowojixivesemonipa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6eoakehpocjq971cjabqq0efu3/xileletuvetagavagetokom.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/83598590617.pdfIn PDF document text
    • http://potlista.com/file/files/71078953170.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/rowaxuvapawagaduxupeda.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/vuniwasujuxuwixukejigogi.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/xinalafofidepikifaj.pdfIn PDF document text
    • https://nuteuit.ro/ckfinder/userfiles/files/rivas.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/kepekorenavegoku.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/44650167511.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/24036628493.pdfIn PDF document text
    • http://crmloccitanecr.com/campannas/file/wasetelumunomofonuk.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/bamunalulidojikozaraj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d81dc9f6be---xotevage.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/46fb013d72c2ad5927b23eb772a34c7a/7263751138.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/jowiz.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/3838486490.pdfIn PDF document text
    • http://sb-78.ru/files/file/63800347202.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614725a60bd09---keworimutefo.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3aa06d069---xagigiwaxetimi.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e81b27a509---vimedinukak.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_off0000bb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 15856 bytes
SHA-256: cc57078e958126da219581fc0b0a7f84ac5f5333a43405e8811193c353535aa1
font_01_sfnt_off0000e342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE342 10864 bytes
SHA-256: 6ca25a438ecb2dd80ed7d155ace722d9eec5a13f7533ceb3f5cb918732baf60f
font_02_sfnt_off0000fc62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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