Malicious PDF — malware analysis report

Static analysis result for SHA-256 712e57cb9bd87e91…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 17:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7aab914e8ae5f2f1b15b955766a66ba8 SHA-1: 67e8b1b015afdecccee813e8bae81817837570c4 SHA-256: 712e57cb9bd87e91f039b281a531e807ed3c0e074edf9764eb5e616560023957
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to other PDF files, many hosted on domains that appear to be compromised or disposable, suggesting a link farm for SEO poisoning or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/44622758628.pdf In PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/32976237969.pdfIn PDF document text
    • https://sapporopools.com/contents/files/lepalolitasu.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/70305192574.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/30810055404.pdfIn PDF document text
    • http://pieseclimaauto.com/files/file/dosuvejanitawuwewikuruf.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/669e5c91c1ceaf417bb17d2a7f871141/rufojab.pdfIn PDF document text
    • http://www.medicellbank.com/userfiles/files/lalojorazajewal.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614096107d6d2---fadak.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/damolezaxoxejofasakaxap.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/jakefanuvedifafabupeso.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2778711885140aa0f1abf8a7eb9730a0/27150340975.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/i813j29q3pho6r81ih302kcru7/naburesel.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/4626181494.pdfIn PDF document text
    • https://salwangurugram.com/files/sivavave.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c7a83d6bda---4566243160.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/muvazada.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/zikanuzivavamamanunekogis.pdfIn PDF document text
    • http://esistore.lu/userfiles/file/nowuwefanob.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/pigalej.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/66391458214.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/76408824984.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/senix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fly+gps+pokemonPDF 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_off0000d7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E7 10324 bytes
SHA-256: 090a07c06db4e6314ea9aa7b58ac65205c49e0d66b354560d9f60b978b5434dc
font_01_sfnt_off0000ef22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF22 18700 bytes
SHA-256: ee26aa6b8e214777d619aed33792db6cce68c3b56eddc37985f5bab9549dd34b
font_02_sfnt_off00011f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1