Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f10b7efd73a176…

MALICIOUS

PDF

81.4 KB Created: 2021-08-08 05:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c2ef92f14b64923528f5fb5a346d3084 SHA-1: c010e51be891134fb2806bf7f3ab04ca7ccd3254 SHA-256: d2f10b7efd73a176f0295998c2a3795471be8e53ecd293c0bfab8759723226ac
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the URL analysis and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://garglob.ru/uplcv?utm_term=balancear+ecuaciones+metodo+algebraico+online PDF link annotation
    • https://netshopnepal.com/userfiles/file/26731162253.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9248061539.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/9c318d236d6637a6d2114720bc8d9d3d/senugiluxipuwis.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/takademuzuwuw.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/wiladizifetu.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/65658617537.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/debixi.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/ka7gcl7h1mv0n66kt61hsjjec1/mogenusadatifaganemubiwa.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/kegugume.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/81305719103.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/147dc8edf617068e2ec1a29689f4f90f/56777823654.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/6365575270.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a68a0db7ab2---85960874772.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/belegexubebiti.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/51075753790.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/safapo.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/39757826586.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607496aae0339---xenero.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/c06a78c9b1c793270eed060ed7882c57/tigusoxipazavuje.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mv1kbb9uspl3vo6tg7qeq2c0hi/87683093471.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/j9j9vpfpc9sv3f5obnhvl6kqha/sudod.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/93284174832.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/fidatej.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621469185.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_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 11008 bytes
SHA-256: a2a905e0f6d88bf7863eead43af6f89bdf34c3436ac7e8a96e74fc3f05d0a924
font_01_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 18112 bytes
SHA-256: 26cc7c98b15c5320c570f9e0f881b42d2938b4fc83c977ebdc36312b4678815c
font_02_sfnt_off00011d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1