Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75cfcb952ec5452…

MALICIOUS

PDF

71.2 KB Created: 2021-09-15 16:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5be7c43128677181d4f3c0f798a58f07 SHA-1: 882e35a0059ab260428dfeb75b3c1d7ffef58a46 SHA-256: f75cfcb952ec5452aec35ad5981c0ae7a47b564734f87e518b48e76455f35529
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=777+slot+machine+game+free PDF link annotation
    • http://syekp.gr/sites/default/files/file/gulonowosezobixigev.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/firazojiritetapel.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/86293633808.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/nifugejokifawela.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/difidiluxul.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613864e807eda---dukiviseresedijepenak.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/47877961459.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/3543250896.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5feb63573---tolunenivotekafiv.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/55238602136.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210905_073101.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/betuxi.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/zufurazemamilaxatasola.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/6189694551.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/sobakixopadimidotuviziwa.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63ccd32d---muzumumepakonopakoge.pdfIn PDF document text
    • http://kahasat.cz/data/file/18458209105.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/14589695527.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/83545861970.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/38f0jq0n1avat5d302hnobnel8/80539973759.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/39588582062.pdfIn PDF document text
    • https://granitnet.hu/editor_up/29949702148.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ba95055425ea8a37bb9f6baaa89e559a/74750436274.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/nemolepojetuvajapidoguji.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/ranetodamesozexamov.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_off0000b871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB871 14960 bytes
SHA-256: 9fc2c115b6e0e779ef362ff64f27c845cc94b2dbfecddb9a9f1c59da48283081
font_01_sfnt_off0000de4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 10736 bytes
SHA-256: 5220c0f25abf1aceae12ac709b0a2ae4fe18edb03066b1107f14faa6653e7375

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