Malicious PDF — malware analysis report

Static analysis result for SHA-256 688981d3e96feac6…

MALICIOUS

PDF

84.6 KB Created: 2021-09-19 07:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d63eab977221c10f536b74acc6a8a3ea SHA-1: c0de02df584aa3602a8a2fac59729c475b26a717 SHA-256: 688981d3e96feac652664b1ede9bb6659bd16ddd0a65e83bc144a794dc053348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://ketchas.ru/uplcv?utm_term=cara+membuat+komik+sendiri+di+android PDF link annotation
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/pedibu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/26303068011.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630690988.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467e0edbe94---15205794050.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/nawina.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/16391590445.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202109180959078463.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/78543373206.pdfIn PDF document text
    • http://dentistturkey.com/image/files/xozalu.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/nanegupokakifosi.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/12833161461.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/77816329283.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/94590630117.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/1n445o56cpcf2seoaltfk5fc24/kedalivejajalubiwar.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/25429651181.pdfIn PDF document text
    • https://papiratisk.cz/soubory/favileputosorelaker.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/jebanenoral.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/8923907324.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8a76d36e4d76411788a0a739c9d9fa19/10206499708.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/75522302685.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/41866649489.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131b6ca51251---rawaxe.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/17740449805.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/35303144270.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/p5ombgs150rh1e0tsr4jmket7f/nifezifozumebepivafu.pdfIn PDF document text
    • http://land89.com/ckupload/files/52694239558.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 10728 bytes
SHA-256: 7ab8147942393abe6a63b8062d37313e488edb4ce5efcfff51b8ded9f80bf103
font_01_sfnt_off00010171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10171 16524 bytes
SHA-256: d609a72aa0ac67eb406b47499f7d69fc5959b60628f08101d41d72bfa5f9a3dc
font_02_sfnt_off00012c6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1