Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5e3f27b35a7e14…

MALICIOUS

PDF

76.6 KB Created: 2021-10-22 09:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1770c9a8faa70a64508c1d58d15fa414 SHA-1: 6cec81f380d60451162d598a3b49e28d0088d08c SHA-256: 4d5e3f27b35a7e143b6ea54f5bdc05538764816aa226e2d751d1ddb330b41167
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=empowerment+and+accountability PDF link annotation
    • http://tig-engineering.com/userfiles/file/katudisulax.pdfIn PDF document text
    • http://acril.ru/ufiles/files/65402890664.pdfIn PDF document text
    • http://dienhoabacninh.vn/webroot/img/files/72766627192.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/wixul.pdfIn PDF document text
    • http://reyazahmad.bscsaoner.in/ckfinder/userfiles/files/92613444709.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1616017056bf77---73310947072.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f99245bde1---wonipalajolezazubujimogup.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/23063101391.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/59706643900.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/15499224948.pdfIn PDF document text
    • https://koratspring.com/upload/file/wusigabexatawid.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/vazosivovugamalefuzuvag.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/bisoromanipove.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/7719315521.pdfIn PDF document text
    • http://infinity8talents.com/userfiles/file/98833734693.pdfIn PDF document text
    • https://avflash.nl/upload/files/39459819877.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/zotupewesurap.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/kojodatotidijesixagu.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151144562442.pdfIn PDF document text
    • https://motoralbini.it/files/file/9788471155.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16153cba34cee8---xelenugukawimuvamubu.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/ragininavumodupov.pdfIn PDF document text
    • http://sushifactoryazusa.com/uploads/files/letapefexexogadubir.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16172582e44386---kurejobugiv.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_off0000c7c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C9 17044 bytes
SHA-256: 3b382dff86e885dda596a1b763276f6a2fbf3d9e12ca40a06d5ec6313514db3c
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 10928 bytes
SHA-256: 5b7f18060c103069a2daed369d9f7d04e348bf6219f81dd2264426466d295d38

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