Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d1cc02371e7a2a1…

MALICIOUS

PDF

87.2 KB Created: 2021-07-27 03:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9d87bd294ae9db8f54f098d9fab039f3 SHA-1: 6514b6d698e2c881c2f809c72029b12ccbe22f62 SHA-256: 7d1cc02371e7a2a1c8e900eb02f7e94e55792cfb5f5839027e342ee353793e07
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of these links suggests the primary purpose is to facilitate initial access through phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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 http://utuin.net/files/fckeditor/file/kelexemufaduva.pdf In PDF document text
    • http://skincarebylaura.com/clients/862251/File/rafijifosebatis.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c53c9802870---zukemaxiruvoganiso.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aabd1f554ed---71109415106.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/4cfe6d6841e0b18f01066ada0a8b9b1d/vozelejegipozemiluzav.pdfIn PDF document text
    • https://orrizon.ru/images/file/nuwugaxenamabuno.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/34259077465.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7f4b3c3de064941e628d21c94e8ed0f2/79119764263.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/49541711108.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/monofoginavaninug.pdfIn PDF document text
    • http://efrex.cz/files/file/30191049669.pdfIn PDF document text
    • https://webmenuplus.com/images/file/gegop.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/kezivagikumipozu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c4787994a---rutizejo.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/6105095980.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701a2cdbf40---55765838215.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/75f41mnebc3qvmqtbf7lsdtq21/9527634671.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/30125482434.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/agst83c416ejss3uq8v67eff4u/doselamirezolukog.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-5/file/sowuse.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/33308209863.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/018ee3ada88e847e9b8285d28fcde549/dajorekawufibi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+open+a+skill+sawPDF link annotation
    • 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_off0000f3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EA 16968 bytes
SHA-256: 6be8ad28670e4ca00533fb8bcb6ae68a9594e98ce9e758ef9fd6b7843475b5a4
font_01_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13849 10316 bytes
SHA-256: 3246b078f4a8f7458d9b54f0503d2aaa70043a85f884c9987b69348e860cdfc2

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