Malicious PDF — malware analysis report

Static analysis result for SHA-256 df312127566afdfb…

MALICIOUS

PDF

76.6 KB Created: 2021-09-08 10:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 746ff9662963e72e44b9b4877d9b3260 SHA-1: 6406a4fbd111e542b87ffdda451fdf1c393c8dba SHA-256: df312127566afdfbefa8fb94ee34f2aa430a9224ef5d79370a4ea3e155daeb06
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files hosted on domains that appear to be compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous links suggests an attempt to manipulate search engine results or to lure users into downloading additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://eucolait.eu/userfiles/files/sozenafuvilivume.pdf In PDF document text
    • http://staceyasp.com/UserFiles/file/34869850346.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/munerajirapesufobid.pdfIn PDF document text
    • http://septumdent.com/img/userfiles/files/rajogenokejusajo.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f572a9395b---fozulisenevomuk.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/80404460674.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/54015469793.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/tagalig.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/49222113567.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/78122933971.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/44a43f07b65bf8f1bce9cbd0eee55653/jutirezina.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210622170600.pdfIn PDF document text
    • http://jamxmpharmatech.com/upload/files/77409650936.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608390ef7fc27---vaxijo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aefa7918797---barawesifatumatadu.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mpdif2rhingee9egiuuunt6hoo/72092862793.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/mavebo.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/7067516287.pdfIn PDF document text
    • http://www.andreapondika.cz/file/zudotidolofunakokebofat.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d4a3092f---nutasef.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161262477057ff---totexavexowuralamu.pdfIn PDF document text
    • https://namlongadc.com/uploads/news/files/xatejageponukaji.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/013c7fe9a7da0f201a476c8ad9530baa/76579564095.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7faf8d110---23594253883.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7824f9d31b---zefufeponukupipazizonevan.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/76680766314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=information+theory+textbook+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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 16760 bytes
SHA-256: a794af8d31167c73b240d87e6f52788a2eead29e9c45fe3c79e9b2accecc2e13
font_01_sfnt_off0000f3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC9 10948 bytes
SHA-256: 7cf991522abb1469a7dce2863d87307e7a2730da0ae3b5c97d315fd058b870a0

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