Malicious PDF — malware analysis report

Static analysis result for SHA-256 d928a9327d685ad9…

MALICIOUS

PDF

95.9 KB Created: 2021-09-22 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4523a86709cd0d4befea1e6f3c0d189 SHA-1: 419cd06c08d879ae67287a44e56f05917421bf61 SHA-256: d928a9327d685ad99c4a34df82a89d4ccc71b24dc97b09eedf0dfd7b75495b96
164 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to trick users into downloading further malicious content. The primary attack vector appears to be a phishing attachment, with the embedded JavaScript likely facilitating the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • 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://kaptenhoki.net/contents/files/tozis.pdf In PDF document text
    • http://dallapietamarchisio.it/userfiles/files/25864200864.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/44712441276.pdfIn PDF document text
    • http://saint-party.com/media/file/wimotunasefusorokofosu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/47567145055.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614152d8ef4b7---49947274680.pdfIn PDF document text
    • http://mfcpavpos.ru/file/guwexixonixowamub.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/semunekatopesobewowobu.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/lafitamifobatiwitodek.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/pofaz.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/20541359486.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161496387bff07---sajetojoxu.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/47984556106.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gasalawelijewasox.pdfIn PDF document text
    • http://logopeda-empatia.pl/content/file/jogad.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16148daaf749e1---70483007440.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/17474609760.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418eb36b670---vebawokofumuz.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/ponategojogejor.pdfIn PDF document text
    • http://jogagongu.pl/userfiles/file/9343068151.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/tubujuduwomupid.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/4079513733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=live+cable+tv+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_off00011454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11454 18236 bytes
SHA-256: 6b7f23ab2d7f21d73d5d9b343ba0795ab547e8e1c84bfe73166074815cfcb49e
font_01_sfnt_off0001440a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1440A 10128 bytes
SHA-256: cabcf9fec494ca45187f523bb579d89481b8a27b1f2beab7e07488e8463dc73d
font_02_sfnt_off00015a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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