Malicious PDF — malware analysis report

Static analysis result for SHA-256 553ed9eb73a39611…

MALICIOUS

PDF

88.2 KB Created: 2021-08-13 20:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3d7df26bead23868dd8e148abff0cac SHA-1: df7c5337452faf015b57bdd3d7aa836a843f7a07 SHA-256: 553ed9eb73a39611fe71acf00f99579eb7aaed13ae70c7a3b081a8de36375e36
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and a high number of distinct hosts indicates a broad redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://rajatotogroup4.com/contents//files/54349778815.pdf In PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161151fc617168---fudiwikigesukajareleso.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/c2e473071d643c8b63cd9d5233a87c1c/17281504872.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/zafir.pdfIn PDF document text
    • http://termocity.by/pics/files/35351915413.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/lafubimub.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/20942020359.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/32081996035.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/12442224406.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c7a1a5e5---80188559940.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/192f50b9bf9df5b60c350e86e7e15574/61692555730.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6fu89hcge6k9qu68a993do450u/82314686808.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a149c23c376---vowusil.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/12342492997.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607708e3bed62---xikorekimodu.pdfIn PDF document text
    • http://travisreunion.com/clients/1/1d/1d9c560ef9ee6310b862f4c9d288d7bd/File/zupozizeb.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b067a7ef357---83598463377.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/jemelimalogema.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/grtl1kt3cn968h1be5usqbvu27/demudajajeranedogegim.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608906acb532f---jixotoxa.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6f5c22ccca---zinipubotivukogemi.pdfIn PDF document text
    • http://mictrogiang.com/userfiles/files/geperaf.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/9573657068.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/30359767327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=distinguish+between+statically+determinate+and+indeterminate+beamsPDF 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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A69 17568 bytes
SHA-256: 93af728bd1290d291194e141fb13e797adc0c6fb5b099d18d6728940637b7a6f
font_02_sfnt_off00013859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13859 11140 bytes
SHA-256: f7cc67a4efeab4a7814630b010c5a296cc617583e749e87d9e1a45212e842ee0

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