Malicious PDF — malware analysis report

Static analysis result for SHA-256 c45b2557f31b3098…

MALICIOUS

PDF

80.5 KB Created: 2021-08-05 14:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0d4021f25be561c99f45561ff677be6f SHA-1: d0342d522f8b0139671e08b851d88c6b63a2d1ea SHA-256: c45b2557f31b30987409bacd6b35b39de094cb6d653cb754ff7f857568dcac81
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://olterus.com/contents//files/152048167.pdf In PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8573caafe5---37297719321.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/6nv8jfll2jd1ojtbdq4dvkc59f/bexizimikutafonijuwow.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/271557467397.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/7db49c4e2e33768575b155f61a9bb169/68850841180.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/a8020c3c43ab9c9ddbf737328f337136/zagula.pdfIn PDF document text
    • http://4darchitecture.org/img/all/nedamivezuvazenediwibu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3230a3b8f77811df3f64732fc640f7fb/83803341515.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/bizobapusugozuwaxegalife.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3cd81790c---lugakiwipol.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/razebajisupukivizid.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/jugibisipekaxapofufob.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/10051253042.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cda42f22d---soxokanutevavi.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c0dc757994b4e33a9ca117af4d5786f0/fofoteduganexamimuvo.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/765fc043c9ba851d28d25038b24fe66b/dowogepaliluriwexuxaxijid.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/3oi7b0kgfegfsnm1dm7op5fsg0/pazetakalo.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210529/2105290059552276994wda6r28ggot.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/reforepidevigula.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c010b807722---movoletazirozadokevep.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/8ekv316qtgdkdjnrm5j2nhftn9/13847863908.pdfIn PDF document text
    • http://sns.hu/_user/file/93862159221.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2dlt37ebaht7fjf4i4sbkdfr32/nedadinituginadudaniwim.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2c3bf8275156c206c3d25e1fd128d70f/69662589942.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/98998525542.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=roblox+phantom+forces+hack+script+2020PDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/67735694475.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_off0000d425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC37 17316 bytes
SHA-256: c6686f8dea8d84459a4a32d4e31cf2818e6d525ea91216092037577d8f1960f4
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 11368 bytes
SHA-256: 41d03912b63168fd4872a6156c888cf4941559ffe760ce9b6382a0b567351b8a

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