Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bef16f3fd0c1917…

MALICIOUS

PDF

77.7 KB Created: 2021-09-07 01:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 77863ff122f30f6bd92e144eed62bc5f SHA-1: cff52890349c472e510175ba9957c8caf3b4b4b8 SHA-256: 2bef16f3fd0c1917aaaa4630e203f6766b26e2a2b7b1947d8621769060a4ee55
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to potentially malicious websites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=congenital+nephrotic+syndrome+pdf PDF link annotation
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a8ac72d0---44903623743.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b89ad189a94---monakodigikadoje.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e039135fe6---ziruzok.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/55915003822.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081bafcde750---52700303071.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/12902964981.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/27370172206.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/9130834112.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/as3m711me7i0fkug6dlct3dn07/25525475067.pdfIn PDF document text
    • http://ledson.ru/upload_picture/tusofobevuf.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/38qeltr25tb570hnb415r298q5/nekipoviluz.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/42542648583.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/61367819801.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/88034263443.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/596cshurm6ks2q7g7ajhb3on52/29322598674.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/55515246587.pdfIn PDF document text
    • http://oakgroveschoolheritage.com/clients/b/bc/bc5c94904a1f00f1300372e6f875146f/File/16861143980.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe5f3e927b---manezafix.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/756210c1ba4865abc67b9aa1b5b5e08d/vavezifexutisar.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caafa5ea88d---ledetizemitureb.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210805102403.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/tudufukiditonab.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160757b4781e66---37289990133.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/59932011923.pdfIn PDF document text
    • 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 17524 bytes
SHA-256: 163ae537ca6453dc2fcca5360894f271e7675505cfffe1eda707a190f04dff9b
font_01_sfnt_off0000f6cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CC 11212 bytes
SHA-256: be7658ac40a05b45ca9ae2b60d4f23b2eddab4a88ceb358953a06f08fff109f4
font_02_sfnt_off000110b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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