Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e30703f8416aca6…

MALICIOUS

PDF

75.5 KB Created: 2021-09-09 15:59:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bcc09b92b1e44387461fd2c2e3728ffa SHA-1: 17c11f45368947b8356080026be728d0620a9a81 SHA-256: 8e30703f8416aca6c99f71b94a75adbe434856355446503dec08cfc64fa79af2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The primary external URI, 'https://chcial.ru/uplcv?utm_term=best+tv+series+sites', suggests a lure to trick users into clicking, likely leading to a phishing page or a download. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=best+tv+series+sites PDF link annotation
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161392c7371009---16850910147.pdfIn PDF document text
    • https://eniedu.com/data/file/20210907174548.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/muwunavedimekas.pdfIn PDF document text
    • http://thrifthelp.com/flash/thrifthelp.com/file/49002288712.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bad65c66d---53473119719.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/togubemufisaji.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/22027093633.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132bb723f133---47686233574.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/wavikufokure.pdfIn PDF document text
    • http://ore-processing.ru/d/files/numoze.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/gokepozedadosokesu.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/lumagolubo.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/23017557375.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/26188910016.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nigukew.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/cc0em1a8j41qbtsg1nutvm3o31/36890484536.pdfIn PDF document text
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/91736831528.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/jezowezidezo.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/movujixanafurekamivuwipil.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/66256114191.pdfIn PDF document text
    • https://novsport.com/content/File/61475667251.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/tinirasebupi.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/36462814413.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_off0000c5f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 17156 bytes
SHA-256: 411ef7b16a6b7a1f49a152032add3113e412bf077d77c1875fbcb7f3b6c0b5e7
font_02_sfnt_off00010a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 9788 bytes
SHA-256: 4e336b1d26dbe887bd67a4af460a404216ab66c9eb92299d78390cbe7961f45c

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