Malicious PDF — malware analysis report

Static analysis result for SHA-256 888d73df4c493a28…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 10:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 240b25e1c8eac08663ac8232d6d2ace0 SHA-1: 9e7880ebaa85cf47af986ff34d1438d5ae2ef692 SHA-256: 888d73df4c493a283f7188bc56c8461a4324f248dc48689af6a556b3fa023f63
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of a link farm on disposable hosting and a link to a compromised CMS upload storage further supports this. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://brezov-gaj.si/uporabnik/file/zafosorusebok.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/88118334481.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/12c01b13c8d68c751c909b5ea43d2b30/tabafekaxixodiref.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/68988527027.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6481d643d---xedofekase.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/lakamerixejatefodanufe.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/29503446277.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/bavelegexowevodalowi.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/13235293800.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/9dd2d9eb5bc32506230d7ea32cc2059f/81908424378.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b778797a226---46632159807.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/56254853131.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/98427432254.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a972f0e32b---tijamo.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/futalipagejokega.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/ralevaromem.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/82186298269.pdfIn PDF document text
    • http://tano-cable.com/d/files/85871688800.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ae2f3c17---79026151473.pdfIn PDF document text
    • http://adveotec.com/img/file/41590575518.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160814df3744b7---mesujagedopa.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/32e57c313aab6b283dd960dd8186a19c/gutuxop.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/53053562914.pdfIn PDF document text
    • http://sergey-yushkov.com/pict/file/zemefoxirabob.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/kozuvotodiwufoguvobiposus.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/04dff37bc8e8c398f0f04e58fd0dc8bd/wejusis.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210627_70950FDE95428C43.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=partes+del+cuerpo+humano+para+ni%C3%B1os+pdfPDF 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_off0000dffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFC 11192 bytes
SHA-256: da67590cf0cf755aa115537296b54c29a3264bd0c24de69fb441c6f3b55df3d4
font_01_sfnt_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CA 19084 bytes
SHA-256: 40e03e94b47c1d73824efac2447fb1ef9392365590cfac6efd0d5eb29d345264

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