Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1fd42bd0f37688a…

MALICIOUS

PDF

193.1 KB Created: 2021-06-27 05:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 776574188f553aef57e5e06b6f196b82 SHA-1: 13681dbfd010a906ff0bef96a54111ff73a8ed0e SHA-256: b1fd42bd0f37688ac66bb637055957fd0f382b20b5946a141c234c8c8485e8c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised websites, likely intended to trick users into downloading a password-protected archive. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with phishing and malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9067

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/20b5302b1e0e1243b294ee6a7d85f8f9/63663104889.pdf In PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af9638b9df---kefonilovoxijetovuwixosa.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/c04vq1ppj02ekur3r8h76i7ehm/pulur.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0bcf3900f---36127533580.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/45508336892.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/jro1cog2l63odhu5a7j0mg8uv5/89022554055.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/186a3ad2b07839a2acc190504b61e08b/85169915794.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/mimaxosidatevopoditup.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/ganosubizatugijasade.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3007121d6---gemof.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/wudinojafetezitab.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f64b23bb6f---zimonupo.pdfIn PDF document text
    • http://brlairport.com/images/file/32751786939.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/11714673880.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/09mtapen8dmg2jeed626rcsbhu/kevovetedobafi.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/0f3c1ba0c271ea0edc2763697646ee25/nirazupeselig.pdfIn PDF document text
    • https://victorybear-info.com/userfiles/files/27649248151.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/fupifep.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d031f793b3---wudot.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/33d36e3c10b078d954b44bac7b052c91/30337825337.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/32976715061.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f60eb7551a---75752963067.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b8001b80448---kuvomutuvigodofofawa.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/d67b2bf2cffc6d6302ef8d2778878af8/25486180150.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/76029051254.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/sevatuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=black+hole+formingPDF link annotation
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27817 16232 bytes
SHA-256: 338cc954a946a7fbf70b29c55d5e66db99b2ef151e94d540d22e7b387f44db23
font_01_sfnt_off00028df2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DF2 21528 bytes
SHA-256: 548628062781fc8cabc7562a37832fd1bdb7a6a237d9418dff0eeb2a97fe0179
font_02_sfnt_off0002c5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C5D6 10664 bytes
SHA-256: 1890a96ba058369af8c82921d9ca1602c0d4332f2442092718cd1cce9fad994e
font_03_sfnt_off0002de16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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