Malicious PDF — malware analysis report

Static analysis result for SHA-256 a930a3ed9974055f…

MALICIOUS

PDF

100.1 KB Created: 2021-09-08 01:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c724d981cd38ac0f8018ec07a6c7e0e SHA-1: fd67d69e8636de7d4595ab192cec47157922b786 SHA-256: a930a3ed9974055ffab1fc2b279a2b1054aad2f05c66570b88a5c57a02874099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or trojan delivery mechanism. The presence of numerous external URIs, many hosted on compromised CMS uploads or disposable domains, strongly suggests an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to host and distribute links to further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://hosvagyok.hu/userfiles/file/kapofuvexavefenun.pdf In PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160dcbdf788eb8---49309470506.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/38361413248.pdfIn PDF document text
    • https://tempegaring.com/contents//files/vojovugalajaxusigew.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cf43e13420c4e32f72c5042658303345/31435284924.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/sirutomukomexibimanetixiv.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a12a3e26e---depazisumi.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/32161491344.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/70566873541.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/736114508611dce334297f.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/94548921735.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/45234769507.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/26572596682.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b74ceddefc0---26457413492.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161197fbcd75bd---19149300530.pdfIn PDF document text
    • http://usmleworkout.com/files/file/28277449098.pdfIn PDF document text
    • http://anticacarsulaeborzoi.eu/userfiles/files/77108667865.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/52970585168.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/a5ce31912b572b8a4595b76c8743d600/wejozokis.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/siroj.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/duxevavigegi.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/eakmkdmauecsavc6cdp6na8d3s/98703317179.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/2f5rm0o32it3tu4b2r4kbe9bbh/xuwiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+schema+therapy+worksheetsPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E0 18716 bytes
SHA-256: 7e9edb0018c4c90e1b2ccdc9ab4d60343fadf7dc1ce245d988724230136c5d0b
font_01_sfnt_off00015237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15237 10668 bytes
SHA-256: d93429269a95b6fe3f1828a05da35462f1c8dbe67da7a4244674c17f0c5b2e4a
font_02_sfnt_off00016ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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