Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8cd9b086ffd22b3…

MALICIOUS

PDF

102.6 KB Created: 2021-08-09 05:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b02330c18d1343c65d80320711869f8b SHA-1: 45b62e9d7572b3e9a29894bd55f2318a1d16c732 SHA-256: b8cd9b086ffd22b3a75715850c07285eb8565e91e0bdf5cb332504837290a6f3
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure as a link farm, combined with the nature of the linked content, points towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ketchas.ru/uplcv?utm_term=resumen+gram%C3%A1tica+ingl%C3%A9s+b2+pdf PDF link annotation
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/ee89c34a633e0438ebafd9660dc5f580/65391406066.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/mevupar.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/rv139k657s6lo9iqgu5orq9ll4/18097253932.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f0aee1c99b34fb37711b4378fe458b96/65579734236.pdfIn PDF document text
    • http://cn-noah.com/uploadfile/file/wiruta.pdfIn PDF document text
    • http://rayer.cn/d/files/xemefotelafuxo.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8ef21910e2eba12b9b99770f6c05727e/mewuxufaximodipos.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093a1d8e31b6---kumosedonifelakati.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ra1roqv7vdhg5hrnretvnl9u5o/94195381620.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/31901452211.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/27276949926.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/gusin.pdfIn PDF document text
    • http://thomasgearon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxazumexijobotanifif.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/nefujagakafafeneraxebav.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/porudasewur.pdfIn PDF document text
    • https://stvorki.ru/files/file/rifezinefagiririlavovem.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/hasjfc550bu51bmqid6m2okhv2/13881884269.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16078f5a3be8da---45577790017.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e6af1b23f116406d9974e22acd81f648/xajorujiraje.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a6212d563340feb0764e11c83c5495f0/lotupapadenajejifikevedar.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/mudukeretezivevixik.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/cf7be1a1ab2893bb80b9f763c1514fbd/65562813371.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b26c2b1f0---48992779903.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/56990994532.pdfIn PDF document text
    • 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_off00010c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9A 11584 bytes
SHA-256: cc482c351f93137fdd009647e081222a1a0b6c3064d0d1610b50cf1ebf226feb
font_01_sfnt_off000126fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F10 19604 bytes
SHA-256: 9491cf7332e9a430d61e10af472c0fd37e3f76f50535256cd5649bbf04fa9671
font_03_sfnt_off00017144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17144 17200 bytes
SHA-256: 425efee810714bdf1bf77221106929575631ebea8ba446b519a4bd0ec253f4fe

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