Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdec978e357910c…

MALICIOUS

PDF

95.4 KB Created: 2021-09-13 02:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c29eabf75e369a61dc654d02b782619 SHA-1: d74c1a78268ba552665793faa9114da3096d44a5 SHA-256: bfdec978e357910c1f507eddc06619c08571613628311047991e0417950c03a8
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://sk4education.com/ckfinder/userfiles/files/wezimesew.pdf In PDF document text
    • http://klenderbio.com/upload/files/ruvami.pdfIn PDF document text
    • http://sireny.net/share/files/gagasilotaxufemumaro.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9407bc385739d107b4d590a483956ea0/kagoguzire.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/iiaeo7lujsf5k5dashmlfgjs05/93871064986.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/kobuvixudazazofapovuz.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210905005719.pdfIn PDF document text
    • https://partnermind.cz/images/files/kosenetukejozejebage.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/natoxesexuxisunukorowimoz.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/puworaxegamofo.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ninu92p3tgv9shibiekn2duqlm/24143360684.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/dajigaxisufabar.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7f3eb520---wodesaworutum.pdfIn PDF document text
    • https://posh.hr/files/buzoritekok.pdfIn PDF document text
    • https://gornjastubica.hr/files/vanor.pdfIn PDF document text
    • http://e-sportis.com/images/upload/11494925244.pdfIn PDF document text
    • http://khocabien.com/uploads/files/mogerajaxatogevawasaxa.pdfIn PDF document text
    • http://santeh.md/img/files/vugit.pdfIn PDF document text
    • http://goref.ru/files/file/15944610713.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/galofibuzogizad.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/35952582708.pdfIn PDF document text
    • https://hssanesteban.cl/files/luterotilaligafasuvij.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138cc9677d9d---zukakumesuxajubojugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+install+mobdro+on+android+box+2020PDF 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_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12800 18232 bytes
SHA-256: cfc9cbcdfa2c4fff9e6c8a6e1b17500dfecab7374d2d9de55d3f405085a6afe5
font_02_sfnt_off0001575e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1575E 10840 bytes
SHA-256: 561856547f635e0e7240772555256a7c649f0ea65e8eeac80558e64dd83f04d9

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