Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2420edc9db4b5f1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 19:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bad751fd401ebc1163eef988d64ee374 SHA-1: 29757d640749931897cba631682e43c113e11ce9 SHA-256: a2420edc9db4b5f1fff6505af7ede35b0fd7fa830b438c51d250250357123e87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate a link farm designed to redirect users, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://huntic.ru/uplcv?utm_term=ocultar+barra+de+notifica%C3%A7%C3%B5es+android PDF link annotation
    • http://solarissoft.com/img/userfiles/files/doluponej.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/woxogas.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/posufexa.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/gizugudidivi.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/25740259098.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/figujililimizejixevux.pdfIn PDF document text
    • http://dezis.ru/uploads/files/21493203202.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zutoguter.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/sutusel.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16135dfd58f380---7088053899.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613df86d7b261---nopinojovowon.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/pevuvu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/15122716917.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/733354898.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210908145710.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/22027612317.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/lofekajun.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/3125114298.pdfIn PDF document text
    • http://theprofitnesstrainers.com/userfiles/file/favavuzirera.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/8053618012.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905065919757664.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614252ce70862---12156553599.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/texidakofawiriruf.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/natofowakumufilasirufumam.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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 11156 bytes
SHA-256: 6dcb62041f4530c0a51ff4ae09f785ce33d8c9ac0eaddfd78937fd7343d22d8a
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 19736 bytes
SHA-256: 1ab157335fd04f03cf2f6c20fb8288a4b18de5384366af3d7b5df29241d6fe12
font_02_sfnt_off00012537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12537 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1