Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d95ede26a4bfb4…

MALICIOUS

PDF

78.9 KB Created: 2021-09-18 13:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7cc5df980b3d529292e8c3d4ec0bd57f SHA-1: b6a3451a55013ede8f0b1a2af0b6ae0628e8ac9c SHA-256: 41d95ede26a4bfb4ee5c08dcfcbc83bdf7a780e33369d16e04275e07401ddaec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the primary purpose is to redirect users to external sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kaplaitalia.it/userfiles/files/nezawupiniv.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff61940bbb---sonesimumodipujila.pdfIn PDF document text
    • http://potlista.com/file/files/74533224328.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/kisanabujiziguboj.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae2d4191b---69289545577.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/f895ae0026608d12f79e8e93a36c7c84/tumaj.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/6795883438.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/jitelufererege.pdfIn PDF document text
    • http://prograsifkalip.com/files/nekupela.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/jonuxotagatizuteweginonil.pdfIn PDF document text
    • http://podolsk-kondicionery.ru/upload_picture/file/62914946172.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/86826453535.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/68819772714.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/6141a7a0ad47b.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c437f2c425---18883593416.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/50905726181.pdfIn PDF document text
    • http://www.moyekolodin.com/files/muxodedasetizivasibipese.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/kufotakudozikawet.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/74607968868.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16145949bf1ba0---supawajofidadivap.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/nijolilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=asphalt+9+mod+androidPDF 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_off0000cf14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 18164 bytes
SHA-256: 77de00a3881a87d7612142b31c9d46bdf5bda4f66967f6d00a470e5b5dfb7f9f
font_02_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 10676 bytes
SHA-256: 1ce56c7119d47a16078f20559ace2c30f8d46ac8d6d1316492018ea03e76a52a

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