Malicious PDF — malware analysis report

Static analysis result for SHA-256 2753438434276770…

MALICIOUS

PDF

95.6 KB Created: 2021-08-08 09:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f99d20c87785dd9698b712438ce1f554 SHA-1: 28ef002077d67e0d99d4863f69bf03dc8a6f79d8 SHA-256: 275343843427677027d17a40f80fe69289b8100886017f95bb4a29e0b6f23683
204 Risk Score

Malware Insights

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

This PDF document exhibits multiple indicators of malicious intent, including a high ML classification score and ClamAV detection as a phishing trojan. The document contains instructions to disable security software, a critical indicator of malicious activity. It also functions as a link farm, directing users to various URLs, likely to facilitate the download of a secondary payload or lead to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.
  • 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://sysyanginguvenlik.com/uploads/files/zojisifetevevelodati.pdf In PDF document text
    • http://terhautz.com/upload_files/files/kojanene.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/83361481296.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/f2691745e0f16e9b214dbe478779de9e/69425595966.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0bf48b0041065f243830db785ad99490/54095168305.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/19926934538.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062406360470554.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/12769816323.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/431935942d885d2f4ad114738a5d1864/63749126571.pdfIn PDF document text
    • http://goldenpoolandsauna.com/user_img/files/mowev.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/81643776700.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210609_AB56DF70B546B1DB.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/58360761414.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/94327119924.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/7b26cd22855599c8c437ca4480af4395/nalumomisevijepadovim.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/vugusuxumaj.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/46179733393.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/bebuxarovifo.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87daa02d5---dumalasalojibogalumajejak.pdfIn PDF document text
    • https://777mto.info/contents//files/98127691009.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/zesipazuximogax.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/27012267135.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/pexunivipediwitezo.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/fuwivanewaweguneso.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/8072168966.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=plants+vs+zombies+2+pc+download+full+version+crackPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 11448 bytes
SHA-256: 59da8a85650ce0051edeb78f1214e0c81f6e7493c44fdb49cad8b9e08e6f3053
font_01_sfnt_off00011018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11018 18072 bytes
SHA-256: fc28be275c61ea7dfde4a114824a0bd912b0d28c1d3f743a67ac0b62d54f372e
font_02_sfnt_off00013f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000157ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157AD 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe