Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d652c170e63f3a…

MALICIOUS

PDF

84.4 KB Created: 2021-07-03 06:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c692254ef491d0ad9e8d08ebc6036798 SHA-1: c2983debd354aaaca98ca574311a61cd2d2fcc66 SHA-256: 97d652c170e63f3a4733eaa8544cd750ed998a566340277295ab2e007f081e08
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 sites, identified by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. The primary purpose appears to be directing users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://branpc.in/ckfinder/userfiles/files/puwoxi.pdf In PDF document text
    • http://zonwering-nederland.com/ckfinder/userfiles/files/saduvajitaxu.pdfIn PDF document text
    • https://cubic.is/userfiles/file/defexugojitesitutafalij.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094013e27038---sekajulu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/dcf995744b00837662c083ce619e5137/72684211008.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160737638d057e---1910667386.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lakuluzirezum.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2e849c8b60c45e6dcd3fa7cd45519ea6/kimefisalaf.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/65674738719.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/e79840a11e4ca6317c459a931480c49d/fokirinokoludoloruwe.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/848d878fde17892864859d95ed4ab22c/niwuju.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160776bb4c9496---14725295929.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160851e0b57357---zasivijadujonijugus.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/85935886446.pdfIn PDF document text
    • https://abeess.com/userfiles/file/8141190386.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/95312942135.pdfIn PDF document text
    • https://dolcezzecaffe.it/file/65358266973.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/uknjv5ie11m98gjarmcujfppp6/55320868197.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/40907763563.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160720b45d846c---rifilozakizixowazafixo.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7vbetsqkde5mr0vabk5adpr57v/bufaxididanatunipuj.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xulaw.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/24896097223.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/ranopojisaze.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75703958626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=industrial+effluents+meaning+in+tamilPDF 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_off0000e3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 10628 bytes
SHA-256: 66da5bd2e43a5799b9c3ebd600cf290a9193e88ee39fbad79b41b8c8c9360c80
font_02_sfnt_off0001141a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141A 17840 bytes
SHA-256: 078276669f652127848a9713f4e1c9c5132a36b70ccb79fe7ac08d521b9b24aa