Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d75d8b03aee9cd8…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 23:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b1965d50b1c431c8751c85084734741f SHA-1: 1ae0347a18adcf14bc49d8e34f9a5c6652fea92a SHA-256: 1d75d8b03aee9cd89ff7b65f4e1788c06dc18dc3e84a137f4d90dc14986f1796
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting. This suggests an attempt to trick users into downloading further malicious content, likely a phishing or malware delivery scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://bmcnx.com/userfiles/file/giwulifififo.pdf In PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16137c221b7808---64767268216.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/fagososivom.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131821caf00f---takanug.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16141dd118f7a8---36356271230.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/ladozuzagafof.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/limunem.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/ccb53c824f61089500ca49ddf58d3ce4/4932349288.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/93736997412.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/zuvina.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/butupezamo.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/mukimevexivagudeviwinuf.pdfIn PDF document text
    • http://ttc-investco.com/img/files/30539611551.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/32263194940.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613970e7b1f9c---81183973641.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/juliwapenukow.pdfIn PDF document text
    • http://om-ar.com/userfiles/file/260507911.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///15014759658.pdfIn PDF document text
    • http://synphabase.ch/upload/file/48886566546.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/6pkul1ht25konaqd66mgmet8p6/tuwigigovot.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/silogiwupik.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/24835645893.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=psiphon+pro+unlimited+speed+pcPDF 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_off0000e688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE688 10716 bytes
SHA-256: bc6cac938e9c84f61de14e3da2dd1046ac05bc0bf9d38e287ae0bd18fc2dd166
font_01_sfnt_off0000feea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEA 17748 bytes
SHA-256: 2edb179be920f23b0f4b4a8f1bcd284dbee7133012c5ad15291f094821049644
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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