Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b34bd8633c4354…

MALICIOUS

PDF

96.0 KB Created: 2021-08-08 02:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55af0ea4e7168335539658cc0663f7c0 SHA-1: 52a9d1c212a7287564e81e0a82662ff6548e5d4b SHA-256: 56b34bd8633c4354d5ecf69ec10967fc57b0e54021423fe895403996231cb83b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=auto+repair+and+maintenance+for+dummies+pdf+free PDF link annotation
    • https://aimara-bg.com/userfiles/file/vobud.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/4d2fd57a1de5ffd8c969905b5ee6a34c/givimodaw.pdfIn PDF document text
    • http://elmaryapi.com/ckfinder/userfiles/files/99977703078.pdfIn PDF document text
    • http://shimoltd.ru/images/file/93221702471.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e8ff1e64e4db4f5aa82252d50769bf53/68631069863.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/5835898633.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/dawobapum.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/d2b86861134e8e8f29828ee5c1e61d3c/faxiwodofepujefubovelubu.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/29690188429.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaf3ee807---45767768429.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/na50k9mvqm63gq01fu2rjc8dpm/xajuludusom.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/8805877092.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/41515382591.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/durimopasukozidil.pdfIn PDF document text
    • https://matskaren.se/anvandarbilder/203/files/zebikezafaxawowotuwe.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/bavutupepowur.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/jakoxuzovinagemuvuvotap.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/juxuxowutubasejosuzegiku.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/028be4b83a3b0908e7619dcddbe8f703/sujiwifagatugufawivek.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/dusemaxitigudevojakuj.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160946a97d263f---fawofo.pdfIn PDF document text
    • http://tokyoracing.hu/userfiles/file/wonoxikofukodemav.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fba1c843312---80649763611.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06da959bc---fumadodasirutasekewe.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/zoniromiwi.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_off0001113e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113E 17304 bytes
SHA-256: 3075ab657cbb0bd880f6094dc7bdfde88031d42735c6b4d840a6519360b9d5f8
font_01_sfnt_off00013ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000156be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156BE 10816 bytes
SHA-256: c8bca578e2e18867964a2e2a9d696d81343407da3fa090c0a2390d543f9196bf

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