Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdd1d462177ebaa…

MALICIOUS

PDF

83.0 KB Created: 2021-09-19 01:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e2b78550e99d4945806305cbaf27fbaf SHA-1: f418253e027d7222e84d9efb22ee21b683324cf1 SHA-256: bcdd1d462177ebaa76409a65a45d7c872e5753165e1352880922a02ee11e3006
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, often with UTM parameters, suggesting an attempt to manipulate search engine results or direct users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=adventure+games+mod+apk PDF link annotation
    • https://thefertilizerproductionline.com/d/files/xetagazakuvoxazerekipat.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/792c26fbbfc6f1c77534867166ee9720/69201641046.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/21983267978.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/20703866513.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/bigikaxonejusamir.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/70160559059.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec94152794---narisumorunew.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/96221603367.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/zoxewuketofewofuxiwo.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/xozojepib.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/32352389081.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/tifoj.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/gininedaxikowabomi.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/76484716493.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/dunowa.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/pegumeke.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/3d50879d884faf14ca5723da2209a4e9/14953054414.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/jekesedanomewi.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/fexegakasogogisuzoxo.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/4808052321.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/96472914073.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/difiviruvamota.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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 10836 bytes
SHA-256: 4133c260d72fcf6c7e6e19da1b48bab8705e2751b16be21f53503e597a37b284
font_02_sfnt_off00010f8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 18088 bytes
SHA-256: e73c7ea847a7306b5b9d730fce36c571322f51fe6b94b5bc7d5a2f7a9dfc085e

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