Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e8317a7fdb09bf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-06 03:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1e0d730e68833580ef7e5a83bbad4fbd SHA-1: f11ffc5616565a166ef5590d9fe958fa19e9eae2 SHA-256: e9e8317a7fdb09bfd9e84be22349c9888cddb0a3203a4294c3206a12f666c2e1
96 Risk Score

Malware Insights

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

This PDF file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the heuristic firings confirm the presence of external URIs and a link farm structure. The primary purpose appears to be redirecting users to potentially malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://archism.ru/uplcv?utm_term=diastema+closure+with+composite+pdf PDF link annotation
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c562ca0b1---26121153748.pdfIn PDF document text
    • http://gdlianyu.com/uploadfiles/file/senutadavibojojovapo.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/vakudirazosawagodusir.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/69299997131.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/40327235842.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/12f06ba70a5cb0a919d79098a2f374e8/nebebujibukixexe.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e12351350---duvivem.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/rusimexafabefokiwegugun.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/28c3a62dc3e599a96fa01ef61d0c4738/kumotatejexipozifabe.pdfIn PDF document text
    • https://fratellifurloni.it/file/wepaxaxigum.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e56954197d---wuvagatatatenitewavo.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/lokobaso.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c1026c721ac---36380896130.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/10368288429.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/47358045231.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c0e357831---40488652886.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/53276391070.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/62582875524.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/cb2ba3ca644b4da9708f9aa31023c630/bofagepukib.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/zunudiludexopirefarof.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ak8b58v8lbf9dhj657bq9citpm/96735203046.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9c2652b26---72301246394.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/gijuzebugik.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/78880643592.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_off0000b503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB503 10968 bytes
SHA-256: 42862fc3b56e8ef9131dff4564d417f8521bcdd2b2268b11242907c4bfca2e5c
font_01_sfnt_off0000ce8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A1 15984 bytes
SHA-256: 231b4a4bd8f2e8caa3a242060a8add325a236e25a10832d27fc9363ed0cdebaa

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