Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ab3529553adb145…

MALICIOUS

PDF

78.1 KB Created: 2021-10-03 09:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f8e2d9b260fbc56fc07a925f1d1d9360 SHA-1: d90e89ca928a3379e543fcac047be8ef8f874a49 SHA-256: 2ab3529553adb1451c6f5c05fd547bae4bcba0117b5bc0ccf112141adf565d96
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to other PDF files hosted on compromised or disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://falconartistmanagement.com/ckfinder/userfiles/files/sosoragunamatulebave.pdf In PDF document text
    • http://proximeo.com/ckfinder/userfiles/files/68312805841.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/4238540236153d300b26e2.pdfIn PDF document text
    • https://granitnet.hu/editor_up/64174365167.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/narumasarinekoxuwe.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fotijez.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/mujol.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/83598766246.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150c5c5e453a---61211221261.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/11596816153.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/jeduwukowatobux.pdfIn PDF document text
    • https://worldtradezone.com/userfiles/file/11461562346.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/61528139266.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/nivulejeputuvozawotoriru.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/28nergqgsje5pkiuhhqtbhcls7/xosuv.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/sozozupubedebexulowu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/n7ddp46qg89f8cmaqcrpk3qt90/kaxegarekew.pdfIn PDF document text
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/21709487261.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/dokuketuxev.pdfIn PDF document text
    • https://kopari.hu/files/file/31316574616.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/99084399257.pdfIn PDF document text
    • https://novsport.com/content/File/67497327373.pdfIn PDF document text
    • http://lechioutdoor.com/userfiles/file/poralukikesunez.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/89647713218.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/zukefelamixeruwugoleremi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=download+ultra+shiny+gold+sigmaPDF 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_off0000c1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F7 10864 bytes
SHA-256: 06e733fb1c257b95182c2725c3c69088fca4c96ca05d84e68629762292c6d639
font_02_sfnt_off0000f2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 21392 bytes
SHA-256: bf64c60582b831eed63ba1608a042c52a86d178c5486a7e741b722fe6cb8aec2

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