Malicious PDF — malware analysis report

Static analysis result for SHA-256 2775ee064aea2261…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 18:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c93197295b37b76d600940c6f728c830 SHA-1: 7401024dce1efc068b5910b22da671883deca2df SHA-256: 2775ee064aea22610dc3ef08c77e0dd3eedc938a689800b1a586e683cca8298b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier strongly indicated maliciousness, supported by heuristics identifying the PDF as a link farm pointing to compromised CMS upload directories. These links likely serve as a distribution point for further malicious content or phishing lures. The PDF's structure and numerous external links suggest an attempt to leverage compromised infrastructure for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • 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 http://goddesshair.net/upload/users/files/joduresadigemi.pdf In PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/dixutomovinegixapabaxu.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/vadaxolulizejobim.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160abfbd11c027---gifopuzaboniruvanerag.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/37503989516.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81c74ae91e6c6aceb06e54d6639752c9/98163853798.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/dubigejasux.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/785acc7e7ba6a390f234f24b916f9f88/49221593786.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/pusexufozefiladejubawi.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31f6ee4b20---zizuvelemigekozagi.pdfIn PDF document text
    • http://austria-ex.com/images/blog//file/batoban.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3a4f5c0748---56009588047.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/83272986361.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/84604a9c46fbc0d48a8d9b5a9f13f5a2/nakaxetosogu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/efdbca959824786bb778a9fb71510ce8/lubusizob.pdfIn PDF document text
    • https://chp-travel.ir/data/file/nexabowozu.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/lumemoxawu.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/sixusumabikirazifizabizir.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/gijab.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/komemofaj.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/18399975386.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/7642359533.pdfIn PDF document text
    • http://redondoclassicburger.com/uploads/files/bubetojuwerifapajibuvuku.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/d23b4a92b393707fec74b27ffbcb2819/riwopedojobezag.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16125bc985863b---netedawovi.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b0461b514---wapoxizozumaborujagomogo.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/jigigale.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/63207938774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=salvador+allende+ultimo+discurso+pdfPDF link annotation
    • 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_off0000e5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 11020 bytes
SHA-256: 34982987bcdf1cb8008f41bcda05aca46da31eefb44c899780f30ea993abad5b
font_02_sfnt_off00011775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11775 18588 bytes
SHA-256: cbcfd7fa69025f1520a16f14fcf85b2ce3d0963a1c56edd6d5a60dee08240447