Malicious PDF — malware analysis report

Static analysis result for SHA-256 11fd4d69017f5b04…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b059affe6d509a4a9f0e96babd6e8a4e SHA-1: 6afa7b2aa021969a99f7368f2059baeae08abe7c SHA-256: 11fd4d69017f5b04678543716dcda6aa9ba0e758520cdbc45141bdd726858b2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO poisoning. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://medvor.ru/uplcv?utm_term=fortnite+codes+for+free+items PDF link annotation
    • http://astprom.ru/sites/default/files/file/67268482319.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/dugojesilojidabaw.pdfIn PDF document text
    • http://artin-intranet.com/ckupload/files/biwuwosuv.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16138a62231d54---98040438783.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/mareni.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/tepizirimudofewirosigiju.pdfIn PDF document text
    • http://sintniklaas.kinderopvangpimpeloentje.be/ckfinder/userfiles/files/gumemeve.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161392b9dc2db5---wagivawozif.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161378f8478a42---finugumisekefazit.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dfeb27d44---71764810667.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/67321053137.pdfIn PDF document text
    • http://davcpundri.com/css/file/tuxasefemuvoxise.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb18df72f---35381711282.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/8967545823.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/35983340205.pdfIn PDF document text
    • https://ibexquimica.com.br/ckfinder/userfiles/files/26664996861.pdfIn PDF document text
    • http://snsi.jp/image/news_file/lomeverorejiwub.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gizisasipal.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/31221300887.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/nibobanezo.pdfIn PDF document text
    • https://euforbiabulgaria.com/uploads/pages/files/91029904367.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_off0000d5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 18204 bytes
SHA-256: 220dfe89d88eb5a862e215043468310f2be2871e296a9da5ad882d2afa014578
font_02_sfnt_off00011d8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8F 10408 bytes
SHA-256: 7c41cc3dd6eb2fa8a317a0aaffd9c938bbc6d0c7961871302c73630d12d48b3c