Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4131cd2d69ba44f…

MALICIOUS

PDF

88.8 KB Created: 2021-06-30 00:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4c84e4fec67b10e4ba077857274adf3b SHA-1: 17646fb2423d8bdb0de99b1a94199e864dfd6cee SHA-256: e4131cd2d69ba44fa0573863f4e584fc61e8f474c2d5f683edc7b333a4d1d4a4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://bfr-bialapodlaska.pl/userfiles/file/mubuwekuvojadujirimiji.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607751ae961ae---winim.pdf
    • http://timandlor.com/userfiles/file/saruporezuxer.pdf
    • http://purofirstli.com/userfiles/files/73598022596.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4bcec592b---94237866843.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/87893680992.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160782da288dd0---vigedoferebugilivaromuji.pdf
    • http://mevlanaasm.com/resimler/files/16692262728.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c85eeea8cce---bomoxotakobux.pdf
    • http://boschvietnam.vn/files/usersfiles/files/timejokituvuk.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a019f56ec0---folakaxugakidumewefisenem.pdf
    • http://insidethedigitaltrend.biz/userfiles/file/saxudidimon.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/pkiuq1l7nl8vg8kei3hji6f3i0/53561204001.pdf
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/85888600193.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/p4e3mg6vv4oa8s0tsv2ih757pq/pugofuduragexitevutifuvaf.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/384e8f1e20341f397098bc6d8cde8fe3/dixud.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/5c5e3e5f7b39b5c5f33393cb78dab78c/61863541169.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/43fa5b0f3d0c0d574ed3431cbcf9fa11/reralodasajuferovo.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/n58v7neccoqg7dgnrb2nb7uvbs/gisosog.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b230d02ee60---fosemaferisixat.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f39c6f05ae---luguwuzojuxawozifisute.pdf
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/015cbe102e128abd2d7d52cf9df7f352/litijoseb.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=cbse+class+12+chemistry+notes+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d7.bin
f6f311bd486b16aa1ba12f2bdf2b2721d44da035e6e99738f82a336a510c9fa4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 17824 bytes
font_01_sfnt_off00012304.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
font_02_sfnt_off00013b1b.bin
ee7f792c10d979debe0ed6637216047292c80821acf6c84047a58d5560f08927
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 11428 bytes