Malicious PDF — malware analysis report

Static analysis result for SHA-256 e33349fae2075a8c…

MALICIOUS

PDF

82.8 KB Created: 2021-09-04 11:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eeda3be23c3170917486a26c60db3b2b SHA-1: 96ddc83da120af0ca25eea7b92ff7027829a1f63 SHA-256: e33349fae2075a8c68d52254855ae5456d1b2d7019ecbf070d20ccb94863fdeb
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document's primary purpose is to host a large number of links, likely for SEO manipulation or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=kerala+lottery+result+today+live+pdf+download PDF link annotation
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b350f74a2e2---55095749578.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/85fd2e38543d10de4d9c857c2ac33bff/bosokezitorajegiv.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/kilutowarumotupuwiveja.pdfIn PDF document text
    • https://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/v6f36dcc2158p3bdo4gdd7egt4/91668106815.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/lupowuwejigaxu.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d192f7f33c348108228256956db4fa70/lazagof.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/71729171366.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210530/file/4280665313.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/72359337961.pdfIn PDF document text
    • http://www.moyekolodin.com/files/zinawakageselogasuvudor.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/wagotubamu.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/vf6ume6gv3u8pb4ecrfo155b6s/zunojiba.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/madoxela.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cef4f1716568bff5cba123393e09fc58/21746544483.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/51628039076.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb8bef9fc---61787168460.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c0d37a168f8---dalujumutowik.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/32092487674.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/a18a6f0c625313c1436fdfd5be67e0b6/zazipixedasa.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/28789084157.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_off0000ddc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDC2 18016 bytes
SHA-256: 0d56217e1348c8fce7d59ec0e4b8ba2baefa49c2267fbfcd9b1cfc9ac909e873
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10848 bytes
SHA-256: 58471216999c6000c40dfdbfc446052dc3bac63b7646679f57a25637d42f2978
font_02_sfnt_off00012561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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