Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed97b0ac68fd41e…

MALICIOUS

PDF

85.4 KB Created: 2021-08-09 06:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d0c0923cc275526f84582ec0002c46e SHA-1: bd14aaa2ab6d6be5a414fe358d1f0c08d153397b SHA-256: fed97b0ac68fd41e134ffb3ac025ad41c61f6a9ceaadedb2b721db9498df8db7
104 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to compromised WordPress sites and other disposable hosting. The ML classifier strongly indicates maliciousness, and the presence of a 'download button' lure suggests an attempt to trick the user into clicking these links. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=words+of+wisdom+from+the+sahaba+pdf+download PDF link annotation
    • http://velo.hu/UserFiles//file/69516090067.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/b7c9af7a1ff0698df73b14c102b43f1b/subuwibifujazig.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p379i20r678s7atjl2a26dmul4/towafowijevegalapulonisok.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/423132579.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/j60qao76ipmggrnpj198l980u0/28607845655.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/18887287509.pdfIn PDF document text
    • https://okna-stv.ru/userfiles/files/92419051320.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/52600751710.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/646045936.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff920101a8---karifeduwulimi.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/43139841285.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/gekupixowuzujopovumu.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/xasubezoroxuxeguru.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/b09373654eb7db96874ecb36aba3f7c2/sebabef.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836fcadc4c9---33741823550.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-7/20210707164447543041.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/kiv87pklvrtq8rq61t2m0bn4oe/8600572375.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/27576782880.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734115a940e---vamolofawesewotidisopo.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/jinafatal.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828b3042bb9---81642143469.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608638126560a---81704098810.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/fejalugulujaneg.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/zunoziwodazotedorulux.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mewag.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_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE6 18028 bytes
SHA-256: 0657d064adc205f5c7f461662b8a149bb35997b0c5023ca9931e93b84902199c
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10980 bytes
SHA-256: 62a63dc52753fa0d79a53238bc796fdc1503d67692e5e77ca6334275e6dfef20

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