Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18e06661a55661f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-07 08:35:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 2cd2f4fcfdf29f749d775d09bb447f6c SHA-1: 94e48794df053a12aed24d97bd26f124cca14c35 SHA-256: f18e06661a55661f485dad6fb3e59d6a75182ba863263cbda21a57751a7635e8
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a18f4a77220d761d444270425c1ea83c/6856985515.pdf In PDF document text
    • http://goraku-sangyo.com/userfiles/file/45476277200.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a36e9492463---betamowopupuludileka.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c44e7eddf---virumizezigukibekelonag.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d940053ea6---porojugokanitagufiset.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/26470895089.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16074618639420---36188124110.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210728052722901.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/wevepejubusisu.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/2d35c29d3df06ba6a6dfcb413223388a/46237933532.pdfIn PDF document text
    • http://ambulatorioveterinariocamali.com/userfiles/files/ramaraluzasadupesepasevav.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160afd06709266---75933353633.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a524020d3ba---lazel.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/wazosezituvesugevilomoro.pdfIn PDF document text
    • https://jetaime-shop.com/files/sevenuderemewura.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/32208904508.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/7uke4e7088r9robnt2i16jhslp/wozuvozeredogoreme.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/41588255159.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fbd122dd06637f26dbc8afd2f021e40a/49164584852.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/74959766409.pdfIn PDF document text
    • http://sweetbasketsbyjackie.com/clients/864293/File/fikibos.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/matolojojufamugusipu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=aptitude+test+papers+pdf+downloadPDF 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_off0000d6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D7 10656 bytes
SHA-256: 25da003886737036f4b22969de0675fa3f74bf1e0b87b8eb2c8f2030de0e1b2f
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001078c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078C 17716 bytes
SHA-256: 2d765b7397b4ed451399cb8f54e77edb548459b8b34a418eb6676d2ce76f5d46