Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9730a50bfb3daf5…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 10:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e2c9f24fad7a61a576308273935a17c8 SHA-1: 4dc5cf3b6efcc8956bee5d56b77c95438701d801 SHA-256: d9730a50bfb3daf5d927e272a73e2f2e67bb0acd9b4b40f00d5fa08b1bd291ce
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites, aligning with the 'Spearphishing Attachment' and 'JavaScript' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://fruitsad.pl/images/file/juzorezekadofajelejimama.pdf In PDF document text
    • http://etkindenetim.com/resimler/files/90472998392.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/53233128318.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/tuxisisevovixuvuwub.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ns67gvvcv4bm4cmoq7krqnnten/16177109358.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/93670947695.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/vaxijevudusazumimot.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/57071659301.pdfIn PDF document text
    • http://www.romanschatztruhe.de/img/files/nubetukasiguwulifivu.pdfIn PDF document text
    • http://mundialimportweb.com/userfiles/file/43568158413.pdfIn PDF document text
    • http://akcompany.vn/uploads/userfiles/file/mulikoserimusib.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090301284919222.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/tawabimimujijesap.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/61652692050.pdfIn PDF document text
    • http://kaie.org/userfiles/file/20210913062229.pdfIn PDF document text
    • https://profession-your-dr.com/uploads/files/202109090527039979.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/84826526937.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5ff434fac---penakana.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e370255419---53162615364.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/xuzajometobekizuzifo.pdfIn PDF document text
    • https://edarky.net/data/file/64672709150.pdfIn PDF document text
    • http://rrarental.org/upload/file/tupobewevebubudak.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6ade77845---5443615169.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210913044510.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/zanonebifitim.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/sukupomisuletotadipelaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=transfer+files+between+androidPDF 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_off0000dc20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC20 10536 bytes
SHA-256: e03b3c31f4f156e5f2786fc23d01d107ba58336849349e7678ec125915ab57f5
font_01_sfnt_off0000f44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C61 16660 bytes
SHA-256: ea40a1375ae36d28d8fe82801dcb1a6699da32db833ca863eaa178689764ef46

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