Malicious PDF — malware analysis report

Static analysis result for SHA-256 329210d6c91415d9…

MALICIOUS

PDF

88.6 KB Created: 2021-07-02 21:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 536340d9ddde00563f9156a21897901d SHA-1: e23f2e998ddea357c0d2fa843a154eeec905e91d SHA-256: 329210d6c91415d9c6e4554afaf6fb463647d6726b95141803fdf3506e3de7c9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the presence of external URIs points towards an attempt to direct users to potentially harmful content. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or content-luring campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=plot+structure+of+oedipus+rex PDF link annotation
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160935efb1c97f---jaketaxetonuniropar.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087716c4004e---pefajifedexaxapu.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/vofikodelowugufetija.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/fukitejadujezem.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/51468343214.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2cdaa396c6---38411834295.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/meop440o0dba5qbimh910vq7rs/7908465323.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/bepinuzagawatafamu.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde53e74f36---banuzux.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/63e47cb979357e9d181e2e0f42108cd0/melukepilobasofagirakeju.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840665a49f1---61320303010.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/folorojerifuvokuluzu.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/79720325573.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/sebiverodemujez.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab25a07ec1---59772911398.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/0cd448d08e16ac022fbc5f2fbb3f5ab4/94728949434.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a70a72935---64951780339.pdfIn PDF document text
    • https://fobh.net/userfiles/files/56499203474.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a66f22a6dab---sofasakugodelapi.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086067e20bb6---tozilovetom.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/94522975542.pdfIn PDF document text
    • http://jandebruijn.com/uploadimages/files/runusifikeliponizaramox.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/f3073400b0c7ecc61cecd9d8884fde4c/limalaxokokakur.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/16830651791.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/fojim.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_off0000f8ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EF 10552 bytes
SHA-256: 29167aa49d07ae80b97141afe8cd70d47d5ce68fbe84820dee0baa26185ec0d5
font_01_sfnt_off00011127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11127 17008 bytes
SHA-256: 98986fa4f3f3f97264d6ac25d4284d77b698323b84002abc78de16ab95d74d5d
font_02_sfnt_off00013d36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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