Malicious PDF — malware analysis report

Static analysis result for SHA-256 e21bba2158607e82…

MALICIOUS

PDF

81.3 KB Created: 2021-09-16 02:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d80206d48ead6b3eef0fb78a476ebd9c SHA-1: 1d680ebf3b77ad51944906e05ee3affb86c9fb7b SHA-256: e21bba2158607e829259d5784b444051e95ab1f028b966e9ef35a4ec1c4b4c0e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of multiple unknown URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af8db3b5cf---73074176868.pdf In PDF document text
    • https://projektovanje.info/userfiles/file/giradipowujaxo.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/dumizisab.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/xotenado.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/23931943409.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/76521596048.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/gimuvirexakuxukujawedozu.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/86468260967.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/57220349521.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/93801483119.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/17932634704.pdfIn PDF document text
    • http://www.siposferenc.hu/html/jarovumobogazulanu.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/76951165526.pdfIn PDF document text
    • http://erpos.sk/data/files/63490099688.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/67741274086.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/59033159278.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/zemonepowagadupinu.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/revulanubo.pdfIn PDF document text
    • http://techbis.pl/files/file/bevukewomujal.pdfIn PDF document text
    • http://gardatrans.com/content/Files/76552222787.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96887dc55---fuxobej.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161338b2b4ef92---kivoxudoreninujajebusez.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/76494845712.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/foxamuwetepafufogumix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=scribblenauts+unlimited+free+apkPDF 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_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 17192 bytes
SHA-256: 9a1189f8b3347a1d624f60950f0425fa0591a704189a41ab4f33c9ff5857e63b
font_01_sfnt_off000105a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A1 11068 bytes
SHA-256: cdc6e9ef6b61f79742a868d12669eca4faf131d94d87d78927bbec7c85d337d4
font_02_sfnt_off00011f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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