Malicious PDF — malware analysis report

Static analysis result for SHA-256 97567231ec458b59…

MALICIOUS

PDF

149.7 KB Created: 2021-07-17 11:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d336916a36a063600d086e66fb136237 SHA-1: f337925fe22f834c677f426c9615e001fedd0f0c SHA-256: 97567231ec458b59d2bb6e5802e48c533ae607d2719f15f01079cb92384c130f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress upload directories and other disposable hosting sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary attack pattern involves luring users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9708

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://jatechkj.pl/upload/fck/file/76867491778.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a681cad2ad0---latofapatelusisagixep.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1740a53ec57c55edd816102ec45b1b88/35519460902.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/3932793489286abcb5a878d16d6be0ed/denifaganikizelevexorexa.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/vorikaxugibu.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/bc1817c5d99818a0bf1cad3fe1754ece/xizejaxebakajugovu.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bacf59c5399---79225117484.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16092dbd5080d5---vesofefixi.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/mevanabon.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/pegabefaxamuxoxafadatomok.pdfIn PDF document text
    • http://ligneus.hu/upload/file/donujabaxeneta.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/rebavamanafixuwas.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a154277c0c---jetubi.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/popuresujegonovivegiz.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/heanelrp6plrjcq4p7cbganc2f/24108725351.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/zogoguwefogexewiwukanewe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/sukikudovijonutage.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/93603116359.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/56450819250.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210524091305155.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f3c3ddae18cc137770b054dbee00208f/jufor.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd7f1b0865---23212888753.pdfIn PDF document text
    • http://dnepropress.net/files/file/mevopo.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/rulisulele.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scrapy+user+agent+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 17904 bytes
SHA-256: 64ab9e16d50795f545eba590a2184ae57c3acaac87f53fa6027957aef9b09ef0
font_02_sfnt_off000145ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AC 93752 bytes
SHA-256: c7080a10e07700a5b77d74d3de6dd142aeee7c2f3ba63138f34e1d60b426e5d0
font_03_sfnt_off00022dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22DC0 10720 bytes
SHA-256: 1ccd434523f3f41f09cfb4738ae01b04f2e163d531d10831ac9927a996c5b2b3

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