Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9a41eeccc4ccee…

MALICIOUS

PDF

98.2 KB Created: 2021-07-07 17:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: e8108e421f4a0360a2e81cd7bb97703b SHA-1: b8d4088b1fadd616eeb0508e6a630781546033a5 SHA-256: 0a9a41eeccc4cceec70c16ca62f90daf07011867673b1345619da1852389c31d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common tactic to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/15b5a8e009472886ceaecc08342ab7b2/95059090390.pdf In PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/e5527ae04fe4fdf6d06ea972db96a1f8/xamumosibiribubuwevuxofe.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/zadubuwiwejuxumivarukuva.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160903d6fb132d---5932586549.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/vh9qkpcarve51ams65qirv5j0h/98199213702.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/21864940026.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/45170218123.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a0fb0282---6607359565.pdfIn PDF document text
    • https://zahnersatz.pl/userfiles/files/23952474937.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/10b8ed9c0975582a75fbd55c60ce1c58/megalimexemixovidilog.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c643fd1333d---17488127870.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210607103719_3n29np.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/0fbd0929574e1b67d15ffe50b06db926/jukujidikexanagedewopipa.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/xufokiwusiwarapuxurolorel.pdfIn PDF document text
    • https://kildevangen.dk/files/23282734080.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/82118263570.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nakoduvetujul.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/70271074501.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c878f7dae45---xebovupuzanegebisal.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608671398f70e---68554166062.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f93f8ab4f5---73890977479.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/rpi5ru6s0ds4198dehbsii5198/53715795252.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jrrbrp4egtiavtv90h67d0ptpk/nuvoxagorex.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa6e10ce0c---pirikezamoni.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af31ad23c95---xulusovejarup.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/bejoledeguramulekiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=free+partition+manager+windows+xpPDF 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_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10852 bytes
SHA-256: 5c586e3b7429d6b542c3125eddbd4af524f66be88da5bf59a77cdd0a76a321ea
font_01_sfnt_off000135b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC2 17452 bytes
SHA-256: 485ffef7e7a3adfc30ae2211a2158aa1ea15170e0fee5efc97fae631db57fef9

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