Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7764de9732b3528…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 20:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 602efb8fe37e9379ca6fd5124516986d SHA-1: edf8fb4fc9dd1e2e4b47a5c924806b49fbd3a49f SHA-256: a7764de9732b35286a1e1182c992d40b70bc12e0b61d4bde9a485ac623401189
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, indicating a phishing or malware distribution attempt. The presence of a 'LOLBin token sequence' in the document text further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 https://protum.se/file/23889942394.pdf In PDF document text
    • https://renhedc.com/uploads/files/202109011446365894.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a53846ec251120147fbec930a8025f5c/79686529310.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/wakotugujefunesulugu.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/joxemosetalarogunopelana.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/54739879868.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109140603366063.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/874c4b9d4eae46b55b2e378d3d9d22bf/78943061913.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c76aa2213b8b0a571ec544363572d063/70537324376.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/wupexojinodaxelazew.pdfIn PDF document text
    • http://carszana.com/image/upload/File/pelaposurunuvakuzozimomu.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/81413996081.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/63428044988.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/24281074711.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613480f4a61eb---kemonakevajudo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409badb8fb5---53874910315.pdfIn PDF document text
    • https://sd-olimp.hr/files/4072870769.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/teserin.pdfIn PDF document text
    • http://mcutech.net/files/godulaxokidev.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/1e0edbd24d3f14a90eb6e8da33fb44b7/20025272981.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133fe98b9883---58044237642.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/29086976479.pdfIn PDF document text
    • https://cffcommunicatioIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=worst+chat+up+linesPDF 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_off0000daa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA9 17764 bytes
SHA-256: b6727d58031bb4740b183c00cdf16ef2bfb7f66319696d15137d7de9acfde104
font_01_sfnt_off00010885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10885 10564 bytes
SHA-256: 230f5b579aca18a4b5dcf05f7f0c038d587d0bb8737c62850d9041557f44242a
font_02_sfnt_off00012099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12099 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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