Malicious PDF — malware analysis report

Static analysis result for SHA-256 d381f410417a0fe9…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 04:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a31b83cbcb5fb4f3204e7c586dd7c71 SHA-1: 1a260610a85d59effd12da3db7f584ab08610316 SHA-256: d381f410417a0fe98fa2fad82805904c88cd79a05f0165af98f093f8381ed211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, though numerous, are primarily used to redirect to other potentially malicious PDF files, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure itself is designed to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://casaledellasignora.it/userfiles/files/visekuxoluvimusibefubo.pdf In PDF document text
    • http://digifast.cz/userfiles/tivoferitita.pdfIn PDF document text
    • https://manenshop.com/upload/files/18716783501.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/vewoxuvaxabowovin.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mesonufarojijofepela.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/57ojt4nq6qt1cm2ld5hl0vi1r0/75119320948.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/93820484150.pdfIn PDF document text
    • https://razredna-nastava.net/files/31083185011.pdfIn PDF document text
    • https://esz.jp/img/editor/files/29171094494.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/84336541759.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9558963dc0---87824202325.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/12261500304.pdfIn PDF document text
    • http://fxmeat.com/upload/file/8c9add80f4bb0d31fb5d7a31b86a8638.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/89653663434.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/37040450330.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/vidoga.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c170422376b---rireju.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd75cbac0---51297543918.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/butivuvodimopulibaro.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9794daf0d---9123058837.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/64618167254.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0af4129b73---24856452092.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/41329475675.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/34416626963.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e5a4ef4f---detuxupotudes.pdfIn PDF document text
    • http://wtmongolia.com/materials/file/64525964333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=jurnal+pluralisme+indonesia+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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 18428 bytes
SHA-256: a0cc0bd3f278be2865d8d7a1bf23d8820aab87e54006d71e422e3644b50dc36a
font_02_sfnt_off000128e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E3 10652 bytes
SHA-256: 52806f84488331759e558ca46ebeff11ffeb377415dbcd7679db9426998ec7cf

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