Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c9b928ae7363ce…

MALICIOUS

PDF

83.2 KB Created: 2021-07-04 02:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2e313abe8791f7f953fc3d462a439527 SHA-1: 7925e5378fe528d63297e42fd2749de45a34ca0d SHA-256: 03c9b928ae7363cead2ffc94f7feaa0918c97385fb304171bee73a7b6da6af7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://studiopignotti.it/userfiles/files/31970079213.pdf In PDF document text
    • http://praguetransfer.com/files/file/jiwobodipuk.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d3db4651---vivizagujepidoxegewuweviv.pdfIn PDF document text
    • http://kotolantopeni.cz/file/nerosurebopimewegi.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/nvr1af4skjeo4upooakjoj15ou/patovurudaxadexadubu.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160984ec6c1cab---jubef.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca40bc6312f---43343997811.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/34053255025.pdfIn PDF document text
    • http://budka39.ru/files/83643810022.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/61286331683.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/zokinevowatuxisutifaxas.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/nisewuliwa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b249bd61879---lewupenizapemekifuzuxopo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/kevipimupibavipuraler.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/82067042620.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c55063479---wusesivunigogivonudafe.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16080936434f48---rafirorunekabutikusa.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/99222680661.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/zodarozawod.pdfIn PDF document text
    • https://allianztc.ro/files/file/sizimilimi.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/89631782207.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e179a85fbd19137061272bf6b774a036/8789146505.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/kalegirejegogedazolowugux.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/39399728928.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/64670404716.pdfIn PDF document text
    • https://sub2unlock.me/2XKZR��HOWIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=gta+5+ppsspp+by+aj+android+gamerPDF 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_off0000e270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 15940 bytes
SHA-256: d57a632e0ce2dfd658f74c17ac55bceee16cafa1c648e02344b4bc2e700370ed
font_01_sfnt_off00010b95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AC 11244 bytes
SHA-256: 00744d696137fa3846b8bd180464620320de804e0a1adac27d44defcecf2c7c7

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