Malicious PDF — malware analysis report

Static analysis result for SHA-256 d566eec2bb76ef47…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 23:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6499e7ec044e7902b00772bc4f48c873 SHA-1: 1c73db39dff2c25c8918fd7c9db2a44adc5b8087 SHA-256: d566eec2bb76ef47da3662a3803a70416aab69ec672581f93ce15ccc2ab9d1d8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=devices+that+support+android+11 PDF link annotation
    • http://rymwid-training.com/userfiles/file/12321723551.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f0936f017a9a975f2928978ccda7ce1e/97985722429.pdfIn PDF document text
    • https://chongtham68.com/app/webroot/uploads/files/84250965519.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/xufugonizizonered.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/pudexefodevasum.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/digotag.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202109100927436071.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/14409057863.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/24418415440.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/23492498138.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/jijezepeziwapavegiw.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7cd57948---miban.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/xosadivuw.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/nikotelixosopuziloz.pdfIn PDF document text
    • http://pasaru.com/upload/files/zalatogivubolotag.pdfIn PDF document text
    • https://kimansion.com/uploads/file/motarevo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7a081ca---tofajagubarib.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/78114049281.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/lazeni.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/borogujamakodemorotemuru.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e835a29f88---54714906456.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/gusewin.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/keruvinolu.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_off0000c373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC373 10784 bytes
SHA-256: ca722c401677c1548b1c3a02b47d64bd2673dfd466486879483dc747927a17e1
font_01_sfnt_off0000dc5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f46e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46E 17876 bytes
SHA-256: 94699e6140b14d5326b0998d43ae9ce8837ba578e6a77d5b34948774a0c4042a

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