Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7a9e63a3c50864…

MALICIOUS

PDF

101.9 KB Created: 2021-08-01 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 491a1e3683e610a5fbe530e1d801f0e7 SHA-1: 2edae4737b888aa09498237d68867c96ffe98ae2 SHA-256: af7a9e63a3c50864b5a24eee1216e2df4ad9c8069c159c0d727f94378252c9fb
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm heuristic supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://bannails.com/fckeditor_userfiles/file/zabowowumikudenumavuzejo.pdf In PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b247b9726dc3416dbcf0f9d6a02810d0/tumunobipinijasalod.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/d31f8ef9451b580bbe0f45af42d1e04f/xifibebaxe.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/14fdcb2a74323578f532ec1a11c42784/2993799660.pdfIn PDF document text
    • https://avenue102.com/uploads/file/lorosaxuserubefumaj.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a55f1697c2---31938865415.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160889a3b8b94c---72377443976.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/43509795619.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/20472177656.pdfIn PDF document text
    • http://efrex.cz/files/file/juketirefedufidinebada.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/41322100021.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/xulup.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/venizolopenudijuwovedu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c33d7db5ce---wewabe.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/fb809bddafb36b9911c11b366b8e3458/70238922964.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/difakunufivafata.pdfIn PDF document text
    • https://t2sc.me/userfiles/57934056243.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a26949c55---37034437453.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/54789484495.pdfIn PDF document text
    • http://ipublicity.cz/data/file/29923408788.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16090b66c69bec---jisinojonajire.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71050bc651---73841178527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=capitulo+1b-6+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B38 16200 bytes
SHA-256: ec60e5cb88822817808c323fa0bd5ee0243d97c79e76a7931f715506a4480da1
font_02_sfnt_off000140d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140D8 10856 bytes
SHA-256: 4dda2931cc74b4ca6c787c7ba911d2b674d1d1cecf58fd43a31e4d54e0f7c218
font_03_sfnt_off00015a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A05 18044 bytes
SHA-256: f6a79a7d095fb71d58d5f9a8f7149162b94d09f402d4d4861652a4099ea993bf

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