Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ceb8ec222d4dfc…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 01:56:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 438692af7d6e85643b09814c0dd98fbe SHA-1: eda5627e10cb95cf6d6f1ec080ffb9134b55c0ac SHA-256: f0ceb8ec222d4dfc4f68488e66714ba0e8aea023e95a336dbe8b803e335ce4ee
136 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common technique to facilitate credential theft or malware installation. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it acts as a dropper or redirector to malicious sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://wastran.ru/uplcv?utm_term=convert+online+pdf+to+image PDF link annotation
    • http://techscreening.com/userfiles/files/73050827566.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/jisemadupesixapina.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108040650331890.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/49ac69ddjp3mpfh6dvhcbu6eik/madimu.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/vepivezazelipukejamawana.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/pcj1tqi61bn9d2tcppt0qflb74/lekoloxodefisej.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160702c7bb90de---zepebelobosugok.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc8378134---jilodunajijupugabupulu.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/45dc1392a13b9de2108eefcb9d363945/vikamuxipobilofuwigofiwe.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8f79333655---bifoletogijav.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccecbb7714e---kivizipabovezaba.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/zimipipisowugozujuk.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/furebevijiputifoxudegawa.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c464642653---rawaligu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16210772031606.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/60558419633.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/17789217184.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/94853011406.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/8301d33a200718a99b60b75e165153c4/3094115297.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/43607965280.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/bjpoad3qfhf7pmi5a5lc07v644/29637227005.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/fowavobakemaliw.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/dugurubulanewejuvak.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/5883547537.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 16828 bytes
SHA-256: c9fd4df5b867e0befc7113b74f2dd76d7caaa4db0b26f5908d7667be2ce1dcba
font_01_sfnt_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 10768 bytes
SHA-256: c01703a97e13c72662ea17d75aa706d9ddc0b4d5075a0e1accdf4e7626aec284
font_02_sfnt_off00010834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10834 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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