Malicious PDF — malware analysis report

Static analysis result for SHA-256 2788b431660cc0d7…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 01:55:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bdb6e85576d26841ababd6d14e0f4086 SHA-1: d2b78f92c2eb8df196a50906e28af82190905c86 SHA-256: 2788b431660cc0d79df4b3c45461e5b17a364ae2042791b1d3d9ff7ad8c4e05a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it exhibits characteristics of a password-protected archive lure. This suggests the PDF is designed to deceive users into downloading a password-protected file, likely to evade gateway scanning. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=chrome+save+password+not+secure+site', are part of this lure, potentially directing users to download the malicious archive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://archism.ru/uplcv?utm_term=chrome+save+password+not+secure+site PDF link annotation
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074aa4adf9ae---rexibovosekinek.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/vebapikolo.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/7ba50907bdad285f7fc944d0f2325b7c/59019643425.pdfIn PDF document text
    • https://technische-dokumentation-hoffmann.com/upload/files/62803892887.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094c1f1b3405---33256473972.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e763d0042a---kozobenizu.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/13208793087.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a5365979f---gafezinedubusag.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160926aee67766---luzage.pdfIn PDF document text
    • https://kopari.hu/files/file/51369046244.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/58af3e596253c492d137d501adf6924a/kudafokajokovojiresipala.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/18468424938.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/bogitidudigoxo.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/5e00b8f7fa1b8d1b85bd3d8a163d34da/nazigumuduvupowuge.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/82890418509.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/6fbe921dc84c3ddc53aa0714254fafbb/garibegenegesigovigomeme.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/l2o8r3b8r95fu0m97vd1u164of/depex.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/pibubibuwenekiwus.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/1i94ej11imec6qaphu7nj2ho4k/jodom.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/16081d87ba1003---daritid.pdfIn PDF document text
    • http://hydrem.ru/images/file/77339378872.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/nijobugiwisopevupelu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886ddc4f055---42997350123.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/vilope.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9bcf2aad4a284e94b2bff9fc50e37a20/keduv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11016 bytes
SHA-256: 7dcda5810a794d8eb644d0b94b2be4a5608f001068cc052c1147af96d9381c1f
font_03_sfnt_off00012ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EF3 18260 bytes
SHA-256: ef193b8dca8c6f1e473a08bc40bfae68b465a6b25c0e24c015e46cb7aa570634

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