Malicious PDF — malware analysis report

Static analysis result for SHA-256 36f3c7e17a0d5d81…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 05:03:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6f2073aee33aa8ce916e60dd04d5315d SHA-1: 5c2cbba629728d6d66d0734cf6f525b66356a095 SHA-256: 36f3c7e17a0d5d81744bef823a442d06c8607ba807b971bab2c730fa8d1ee412
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs are likely part of this lure, directing users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://tresonance.org/uploadfiles/76301807330.pdf In PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093e29db9006---61842606482.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/roroposase.pdfIn PDF document text
    • https://totounited.com/contents//files/67200477830.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/79866955856.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/77c62ed2afb87a311d17c6aa9dd6aa4a/13812912035.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc1437e95---58631492612.pdfIn PDF document text
    • http://toonesk.com/upload/pufevesabefalavewam.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/e7c7fdd2acd1cb1d7797c6159634a5a7/4743460126.pdfIn PDF document text
    • http://sns.hu/_user/file/giwaxobetidabakalat.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/50782147652.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/72476032704.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///tanudedokuwozurukujek.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/60480151eb8324d42254e593dc8538ea/87644870666.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16087ef929c99d---tekobofebilinezevevaban.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/11898602766.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/fejige.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa837c0c4---88327963233.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f7da9a7b3---bazomejazabebewitetuluv.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bixusefu.pdfIn PDF document text
    • http://24horasnoar.com.br/ckfinder/userfiles/files/wuvemogigotekezenotoj.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210730054401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=law+of+torts+multiple+choice+questions+and+answers+pdfPDF 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_off0000e5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC3 17640 bytes
SHA-256: a05f3a6447251da2a56e5b571f4eb16348eb9344142eef3070c31d09685b9ee6
font_02_sfnt_off00012bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB5 11172 bytes
SHA-256: 546a2cce386a7087eef95ef1e4c3d3317464a950f747f3a034a5e3e6f9834bed

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