Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b0ced6d280d230d…

MALICIOUS

PDF

86.2 KB Created: 2021-09-15 22:53:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5e392d688292cf563cfdc476b8fedf4 SHA-1: 6dbbce4d4d7d008f57d1794f6a8ae4f29808a40a SHA-256: 7b0ced6d280d230daba283349dfe35f796c0cabe86fd7bf4aeff8f4b5932dc2c
96 Risk Score

Malware Insights

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

The PDF file contains a link farm, with many URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable hosting, indicating a potential distribution point for malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://studiocastigli.eu/userfiles/files/30867173746.pdf In PDF document text
    • http://studiodabo.eu/userfiles/files/55514679083.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/gowuboxubirodupelinoto.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/fuxozikavagitaxisisas.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe283f402d---55412441874.pdfIn PDF document text
    • http://acrgroup.nl/userfiles/file/7814546191.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/51124514081.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161416f6fd3c4c---liwokeliru.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///464524749.pdfIn PDF document text
    • http://vce34.ru/attachments/file/venuzejodej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/15d542c95e99405cc61aa8ced07a81e6/puvuwusaxamalibefu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/5937608640.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc88e82055---22051805734.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/80403095281.pdfIn PDF document text
    • http://holzbau-napetschnig.at/ladikagefofobogugikeduka.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/62834141488.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/74055723546.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/benemabituregefolopuwoted.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/11a7cb90e987d25f8d415cc24c53e9bd/37428152475.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/1577676122.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348abb66452---rebinuximezotisi.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/dc70c852139186263bc96b6daa8b1793/mimebolikatawe.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c095ca5---zokevozaj.pdfIn PDF document text
    • http://mlsconsulting.net/cms/files/File/gajitenokut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ipad+model+a1458+price+in+pakistanPDF 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_off0000e737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE737 11188 bytes
SHA-256: 51f5f7a05ad3eb8a3524cb9309ff796f3fc12e3e0b757715004ff53aeb40c444
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 18768 bytes
SHA-256: 1b28838dca93af00a94b3346e0b8fb82d2b886d2db31497af7589fe3c7547b19
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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