Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a0dbce42ad9b4f…

MALICIOUS

PDF

73.2 KB Created: 2021-09-03 15:42:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 396289b03935d6c7cc9fbf9e4f93b19e SHA-1: f89d133c9321708fa52f3329932f4e823234d708 SHA-256: a6a0dbce42ad9b4f94fc3f2d7108b8d336e4cd8c922e8c896d40e0eadcc1b143
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oliogalanis.com/file/18556913513.pdf In PDF document text
    • https://ozmutludokum.com/userfiles/file/jowopofaletukunu.pdfIn PDF document text
    • http://azizolace.cz/images/file/malejazezejolonigib.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160793de5cebd0---15403528577.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wixudowenowolevikima.pdfIn PDF document text
    • http://riversedgefm.com/files/file/46114994290.pdfIn PDF document text
    • https://andrejc.si/files/file/wuluvumagasiduxit.pdfIn PDF document text
    • https://datajournonepal.org/files/22836841375.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/d9768e17d1ca7dbdc079a167131bc00a/puwusom.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/visimagajituta.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/susuzo.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/jas90ht0j4fo9368kjtrbt7l80/negijo.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cebb6f164e18d9fc5aa4b19adf43c6/10825283805.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/2ol5dars25uf594hgaj47i0h1u/46107924823.pdfIn PDF document text
    • https://limsurdua.com/contents/files/21210461085.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/27677040338.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/fejesogiranoperulapov.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ombf1rkt1eto39i66n8sr748t5/dabesitobajuloselitob.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/69802534868.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/42089786141.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/aced18d0f4717af16d981c14b0f7f8fa/fidolazuditikesapurilosip.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16098932dbfe7b---papemozuwotol.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/59729093081.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/90956927471.pdfIn PDF document text
    • https://bliznacite.com/files/80666416457.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=troy+bilt+horse+tiller+parts+manualPDF 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_off0000b6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6D9 10836 bytes
SHA-256: 988ce5557a4c5349e0c1bbbd8d10a6651f79efd11eb22673a42eaa9574121fbe
font_01_sfnt_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 17732 bytes
SHA-256: d8579beabd4727bed16ed0bd3955f3009f6cc0e8440627d76e6728f12d5a105d
font_02_sfnt_off0000fd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1