Malicious PDF — malware analysis report

Static analysis result for SHA-256 50167172a9c0db7d…

MALICIOUS

PDF

80.8 KB Created: 2021-09-21 06:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2d07a32df0a12447ada57ecee8543aca SHA-1: 91fca65d0b08783b197a6102d5e95f42ee2fcaaf SHA-256: 50167172a9c0db7d8fdac53063d562113fe0b7aa67b642a319cfe035b03724f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. The document contains a link farm pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs, such as 'https://chcial.ru/uplcv?utm_term=download+ldplayer+windows+7+32+bit', likely serve as lures for downloading malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=download+ldplayer+windows+7+32+bit PDF link annotation
    • http://musikpark-live.de/userfiles/file/16983812452.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15264645012.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/k4ppmhbuds96mdtl5bvq0c88t4/kagiwudemikajej.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/98966213033.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/dunotijapukapinuta.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dce6b24e4ee76c3f952b2ffb0316ddc8/42318531113.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614941c156598---loredoxuwupijerimilale.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/96005371854.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nodasudireko.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/60490293813.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3619828a---2522800979.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/8567455207.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/25240329389.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/fakatifitutebojaxixeveve.pdfIn PDF document text
    • http://canissapiens.com/images/uploads/file/nimazadidukijozowof.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/14345364498.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/95290394405.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/livojemevovevu.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/41094748941.pdfIn PDF document text
    • http://cecev.com/stockages/files/18439786937.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/fuxazugop.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pebeludagilirisuliro.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/duduvowevuzubejupetamipi.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/79137528103.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/ganipofenalada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AC 16968 bytes
SHA-256: 94c065e68ff87d9be3e858da2b79daf6a4d997cfb5e05775de1d1d148f2962b4
font_01_sfnt_off00010331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10331 11068 bytes
SHA-256: bea9a4abb9c0c4010031028899103bfd77c23fb096bc8abd1c21ea5fb868f47b
font_02_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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