Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa452d8a2f792d7f…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 05:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1f2f6e1a4fa31d39c89fc086a2631ea SHA-1: 7af7818f312eb3ecca8e6efe90fee9ca3738da82 SHA-256: fa452d8a2f792d7f468ab5eda1b56522a8505d069103aa6232cb364f239bf86d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many of which point to compromised websites or disposable hosting. The embedded JavaScript and link farm structure suggest an attempt to redirect users to malicious sites, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://oniceh.ru/uplcv?utm_term=meaning+of+regrettably+in+english PDF link annotation
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd78d6b4d---wunagekopakadowigixerolam.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/veverik.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c57405807---tebixiro.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/9e42c92dca8ce2f1e8877e0de173c889/kutibizijosesovuseneno.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/3f8p2nb00uiqbtm8e9l4rbjbke/bukukego.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/jokugavotafup.pdfIn PDF document text
    • http://selidbe-beograd.info/files/ludolokitu.pdfIn PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/6525231027.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/rekamowapunobo.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/10485009990.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d4d57d9a9344b703a82d7d89ee8481d3/zijesorebedafuxi.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/migevokakodafeso.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/53571999359.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/72213470925.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/vanevixesulapuvapobo.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/fc1cf7f62450627848778fc2527b25d4/tijerikukimajapivezo.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/36139680720.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/buwaxedubelejazelewab.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/2d42710d2b9f7c9d814005aed6881ac3/pagikinawesara.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/ledir.pdfIn PDF document text
    • http://cke.hk/userfiles/nemumevasafawusuwolijik.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/mumobakerote.pdfIn PDF document text
    • http://ketphatthinh.vn/upload/files/xasokuzanepiwuf.pdfIn PDF document text
    • http://oodow.cn/upload/file/2107300522153981291ica2jvxmlew.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zugadiwosakamawakav.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/ravemuwadotovimomojuvavap.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_off0000c018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC018 10740 bytes
SHA-256: 9640715ee8af9e7b27300d07215ee6b256353665c158b5c4398a19800941dd38
font_01_sfnt_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 18080 bytes
SHA-256: 937db43b8070b5f00c1d1052845737d549c9fd61ed604b25a70b3be7d30db0d1
font_02_sfnt_off00010751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10751 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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