Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af0be450af2f72e…

MALICIOUS

PDF

87.2 KB Created: 2021-08-12 05:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8f90c6d36c43e15120d8a944e366a166 SHA-1: 6c15786ed7d22669d5ca7ed85b55a20fca846087 SHA-256: 4af0be450af2f72e07f83589f314de490554c338d81d7c99b8eaf0f11575a24a
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://hongming-eco.com/userfiles/file/vilefuzosutepewaxul.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/95317588886.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/709d99o4jjb3c2r3dhgtiorrr3/meresudubud.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/jigr2gjdqktr7077j7eq19hnb4/86787212331.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/11043027947.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/45978195325.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/4191894136095cdfcec2db.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6fcd4e4c943f56674e9c771e5a0ab7a6/tosufawufajuna.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/77545992650.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/eed382fe232812380a5ca8f433a78153/sasitasisefed.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/51180835270.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b5072b162a---nalomipejogogojoruladesi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ognvlek5mvk0g5itvic9je7io5/jitoka.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e680b399d3---zolujofetewufuveb.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/23898822229.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/26652108315.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160be309779873---merawoniwigetaxitarakoz.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e410562b872---fabovifizifipuvapapusexiz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/01ccnudosocs6vslu9u2mj8tn7/43242661173.pdfIn PDF document text
    • http://asahiru-ban.com/files/files/67217186041.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m4t6alkl17ulla97iit3gqe9hv/75683665073.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/jezuwexumekeraxereporise.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/nojur.pdfIn PDF document text
    • https://atl-50.com/files/file/60951020033.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/nutiruporetumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+calculate+lump+sum+purchasePDF 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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 17524 bytes
SHA-256: ca0187061d7a2b2f4b1ff5bab1c29cfafcfe6522f4b65cd160ff49686b474b36
font_01_sfnt_off00011e92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E92 10620 bytes
SHA-256: 2eed7b5d79b6f695019b1359069eab2b134f0c7249c51430e0f4d80a16303ee9
font_02_sfnt_off000136f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1