Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84bf6d5e0b0ea90…

MALICIOUS

PDF

91.4 KB Created: 2021-06-29 02:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5ba4563ff27ab936630c29e47acc72ff SHA-1: af6cc253b0cdb6b3061c04a522ffb9a224486e52 SHA-256: b84bf6d5e0b0ea900b03cec9a0d7f9562b766db1e281bd7bdce5a393904c88ed
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many hosted on compromised CMS platforms, designed to direct users to download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm heuristics point to an attempt to trick users into downloading unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=hello+neighbor+game+free+download+for+pc PDF link annotation
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eb3847bb116a62984d3ccad1883ed82/dalosiwimu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/56f2a78a5d0ed8909141d7719ad674cc/razosamazuvademikon.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/qpleur3f95u9s82dum675ah1c4/jinibokadapox.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/or467h3f94sj71g9bte2982to6/53435999005.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/2dda5014816cd23fe4ebdd0b710b0fed/vikokigavotufizubu.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/vaxiwikimewebipofalevu.pdfIn PDF document text
    • https://srilangkapools.com/contents//files/gegix.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/0be68044169db9538c0f26892f0391c9/begijukamanawelesupeba.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc076fdc0---rinemuvobi.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/78240888590.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/wipawabo.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/keziwenegagapasob.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/b8071a5f1d4326aac4c826315d89fc09/86581476419.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16094c0596ff9d---497581235.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bf12377ac3c---fanodenajozavamimidone.pdfIn PDF document text
    • http://naucseto.cz/storage/salavutuguvanepulikulu.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d8150fd1f00f00a531dcdbeaa10f4e9a/65972901606.pdfIn PDF document text
    • https://emmaushuis.org/pages/lobif.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbaf2528e---15811147036.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/cigldh8fg3m6rsd89u8k367unk/76663272079.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608deaef96143---mevopukewavif.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/dutepakogivexup.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/cce8d25778ffa5bd8d3fa8364a36a552/rovap.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/kotopabubatotiso.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc56f6d755---nobivamo.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_off00010320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10320 11016 bytes
SHA-256: 2d6ebfa047de152c2a47b3c0bd383b9045efbfbc3e3f0ca78302c2d589792198
font_01_sfnt_off00011c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 16880 bytes
SHA-256: e162609a6908af701cd84b51227c13f126ec97b21bdf1c86fb79890133755822

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