Malicious PDF — malware analysis report

Static analysis result for SHA-256 f64ed1d828544f3f…

MALICIOUS

PDF

89.7 KB Created: 2021-08-04 01:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b6063c534744f3eee4002d4f2dd27407 SHA-1: f338e922dbd0a114ef6926bc17f9ba0dc0071518 SHA-256: f64ed1d828544f3f0bd599f0a81dd39a063edddf73b156e1d32d48fe471908b1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to disposable hosting and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://targhevaticane.it/userfiles/files/fivumumedif.pdf In PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7c48c2d5c---80982981074.pdfIn PDF document text
    • http://busanpc1.com/upload/fckeditor/file/gitupivimof.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/dewisanuriwekufurivolu.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/49854871480.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/mojup.pdfIn PDF document text
    • http://toyotarent.tw/FileData/ckfinder/files/20210702_C0EDE57161BF53B8.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/suzimanefom.pdfIn PDF document text
    • http://groupkaishan.com/d/files/nagovunixivowavuku.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/nalabe.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/zuwamana.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/45369222587.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-5-20/20210520141948823575.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c46e14d346183a19a69fb2cf258fef59/36673588631.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/6fc252350496fbaa3e4220d18d01525d/gififu.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/31760667638.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/pireja.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/82342843992.pdfIn PDF document text
    • https://stvorki.ru/files/file/diborovotiwunabemoxitedu.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/49430622356.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/10734321213.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/mopinawapidikoniforip.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/ee31aa6248eb9b636705ce0d26e5cdc0/86980349170.pdfIn PDF document text
    • https://paperland.bg/uploads/file/wotid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=best+love+poems+for+long+distance+relationshipPDF 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_off0000f88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88D 17148 bytes
SHA-256: 31f6c73f0d9bb7f68e1e1dd0fc71688f286824d9ab8363aa39fa99b7248db30f
font_01_sfnt_off0001250a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1250A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 11188 bytes
SHA-256: 8a3448e30b2a5b4069da27c88650b321a690770dfc5cb0b090286a26d1518d9c

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