Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8639df20f318eeb…

MALICIOUS

PDF

81.5 KB Created: 2021-09-26 01:47:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac10abe1850d5f8c6768b162bc69f3ab SHA-1: 8afdeac5a0c45de08f67e5a7e20278414da7e1c1 SHA-256: e8639df20f318eeb70e4627bd883ed581a73b82bf63660d0a28f24079290521e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely delivered via spearphishing, to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 https://wastran.ru/uplcv?utm_term=shakti+serial+episode+139 PDF link annotation
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/674e5a9a5011b6837decb52d58a40e92/34501331341.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/kamimisarolurekezeb.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/71168016489.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/sikuro.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/varire.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ad50679aa1edc596897f7ba797365f2e/xoraf.pdfIn PDF document text
    • https://redfortfireworks.com/ckfinder/userfiles/files/33050823742.pdfIn PDF document text
    • http://airserbia2009.vs.rs/multimedia/file/rowope.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/87822622067.pdfIn PDF document text
    • http://klenderbio.com/upload/files/14289807863.pdfIn PDF document text
    • http://strap.sk/uploads/file/tisazedurut.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/wadosagenofonakin.pdfIn PDF document text
    • https://birudongker.com/contents/files/48129662080.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/tusojox.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10027424564.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/foginidisawururukadiwaki.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/1225124660.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/842884458.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/2458498633.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/6223215699.pdfIn PDF document text
    • https://drlanda.hu/user/file/83492300903.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/ucdsn3kb80j7lrs5jfk282uj66/57410156034.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/28253039999.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/fagaxobonumop.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/57192536552.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/sepozuw.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/xefuladebodeb.pdfIn PDF document text
    • 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_off0000ca59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA59 22452 bytes
SHA-256: 79dc08614488d11d6adc8483a54b5b08bee55a61a59c6efa580df4e1c8a3987e
font_01_sfnt_off000104fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FC 10944 bytes
SHA-256: c76ee31d23cf99905cde14e73d7d8b75e4acabbf926cd8981c3ee5f98cae544f
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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