Malicious PDF — malware analysis report

Static analysis result for SHA-256 250d44ed37473b0e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 01:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f17c1e15f380faa08b76a8cce18b09d7 SHA-1: 7f7494edc68ffc5aa43cf86a44ee69f71a6c3266 SHA-256: 250d44ed37473b0e7ff804f880ab21b72b1e88de8da0bfc056a8e3c62a833d2e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and utilizing a link farm structure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO poisoning or directing users to phishing sites. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

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 https://hattshopping.com/admin/assets/images/ckfiles/55942678513.pdf In PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5310eb07---mopivizemiwogudemiduvuw.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/18771251564.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f3335b611---96009481538.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/watodefadomatisov.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4f093d51b---83855476385.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160813b11d0db4---patexolexigifuwi.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/0a4be5a38a4f03d5db60f98a72ef67e9/fizikupuxugalopu.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/tobupeso.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/josuxigemirorivukawo.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/kajapavurasarobujor.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/29834509951.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/49343550614.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071885d9b757---62125206563.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/98025772268.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/78304273149.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210620_154226.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a32364a29c---borefejizu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/aa379dde96efa6ca2f5c648da3af503a/xibaluwefemuleni.pdfIn PDF document text
    • http://mextro.de/upload/files/86667791784.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/12478371655.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/nomakezid.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/vigivamisade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=power+inverters+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_off0000dad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD8 17124 bytes
SHA-256: 1d2f46ad98fd91b4f4f71cf9fd7a64d273216514a421a3f8fe1ce6d0c5a8bb52
font_01_sfnt_off000106f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0C 10436 bytes
SHA-256: 8b39f348d4a64e4a55c3ce110a4865cc089b855a4c155b652c004246b6da4a84

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