Malicious PDF — malware analysis report

Static analysis result for SHA-256 19a9e1b7875febf5…

MALICIOUS

PDF

86.8 KB Created: 2021-07-31 12:37:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0badc7dca036d370f0eeb9da35014a8a SHA-1: 898f0e3eb80eedbf77821bddaf44f0ce46b966b9 SHA-256: 19a9e1b7875febf577b2183d21071f0ca7564e2c7839b2e6d7bbed8f008b6c9f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://huntic.ru/uplcv?utm_term=how+to+scale+factor+a+triangle PDF link annotation
    • http://artospace.com/pics/file/92544702819.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607947d19ec81---13852860302.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/92467019039.pdfIn PDF document text
    • http://short-story.ru/upload/file/88011980618.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/60173278681.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/27643975917.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/658869dd62df7caa17676d42a01f4d27/19053824011.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/95d0ea9a8002c71156daa89c332ec2a6/20114187085.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/11163047826.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/78521754520.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/lemisadujeli.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/40248691239.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c30dbca88---pabevekugilakejos.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/zovopisubupokakuvajinuno.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/bijofinasupazojikiwa.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/944118547.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/xutaveboge.pdfIn PDF document text
    • http://premium-h.info/files/files/bibabiperikok.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/58261251373.pdfIn PDF document text
    • https://vestol.bg/files/file/48861668528.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dd9b0b8d404---4005036752.pdfIn PDF document text
    • https://unosms.us/userfiles/file/zaboxogijaxevobitabegube.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/fufeludidojasi.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6d821937a7ba0cee4ecc777e9df86d57/86051865009.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/91120050494.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021043005585473499.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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 10588 bytes
SHA-256: 53ea1e57c592d46722d73d9afd910da2687b070d3cf818d1de38e784082b8464
font_01_sfnt_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011db9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB9 17036 bytes
SHA-256: 22b6bb715d953a4497c467c010e9d220110a1f0013e6d6d00e4ee8c9070f2109

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