Malicious PDF — malware analysis report

Static analysis result for SHA-256 f78785d3147b15a6…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 00:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cef1cb361b6a56bc0712c12dd71a15fb SHA-1: 5e7103ad1c8eacf41a7e4f1cd56060d4ff6652ff SHA-256: f78785d3147b15a688242fc826a8a4918b4ead7d8869496b8d22d461c71ed6f4
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to other PDF files hosted on various domains, suggesting a link farm or distribution mechanism. The presence of 'compromised_cms_upload_links' and 'disposable_hosting' heuristics further supports a malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://nmcs.ca/userfiles/files/nitenuxi.pdf In PDF document text
    • https://kawanmto.info/contents//files/41678543902.pdfIn PDF document text
    • https://12tiga.com/contents//files/fuwejazenare.pdfIn PDF document text
    • https://mimpishiosatu.com/contents//files/84503942117.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7123ad56---96762286130.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/febeguvuwidin.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160889070a6c33---jumojevekuwinoj.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/27521633318.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/bisalitupegobi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/xopupexilegobozujikovam.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160d068df881cb---94570859858.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/d6c7dffd75bf3c3d1228472b64cecbb3/67255270560.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/hjqtr8gc4sschs8nsofc4qa9vv/xidinime.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/18836810488.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/rorexurokiwoxanonena.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c68de41ed3---wojakivo.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vulololobagefuzusedukat.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/42600886441.pdfIn PDF document text
    • http://firstcuwire.com/file_media/file_image/file/papoxena.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f8e106aba---fobogapozinobemekapotigo.pdfIn PDF document text
    • https://argumentua.com/i/file/23021165696.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddbd84a6c---16154341816.pdfIn PDF document text
    • http://brihat-group.com/assets/userfiles/files/dijemiwud.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/90788140159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=different+types+of+graphs+in+statistics+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_off0000e936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE936 10968 bytes
SHA-256: 914e33b06ddc59ee53a4cc3f25012ab641e19b9802792680bfe0648c3dba8f60
font_01_sfnt_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 17140 bytes
SHA-256: 98a64fb0d75f0e9965de8c571532ae08ed52d9f3b4cb4720f13b754f06e8d162
font_02_sfnt_off00012f03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1