Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce9545c5b043f9d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-24 15:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 199d52b7b935cd610f2294a57aa9b39e SHA-1: 8d8171fbc71ea1e8644f120793b78eb514592f2b SHA-256: 9ce9545c5b043f9d7dc386d7e9d2020d883d6a58560d090868018781df6cd8c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm characteristics indicates an attempt to lure users to potentially harmful websites, likely for phishing or malware distribution.

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://neurooperations.com/ckfinder/userfiles/files/xanajevej.pdf In PDF document text
    • http://stopguepes72.fr/userfiles/file/55442185632.pdfIn PDF document text
    • http://eyela.kr/uploadfile/fckeditor/file/varedisabaseripeluvug.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/55300340119.pdfIn PDF document text
    • http://fluorescent-training.com/file/92696807279.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/wuvas.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/43960605777.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/zuxozegivefavazimodewip.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4a0c913560d9055ac3c563363440a290/kujanujexugukod.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/84681993481.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/nosuvibozaf.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbc38c2518---revokukupewetosusuxu.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139838b8326e---82319538618.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/31494201461.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c7d6963c75---49227971521.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/juludogi.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/sutatomewe.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1348105933613540b717f85.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/85537749275.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/5cmjhs7omlgdkt0t2o363mccdf/42582714472.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/75923713975.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021092012003873499.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109201149361081.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/pejuzekerixoxipimanefusit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=android+studio+calculator+project+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_off0000b59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB1 10804 bytes
SHA-256: 0f0ea51081ac7719d182edb32e787c10d67b50a6d7ba2cf7584c273ecd3f31dd
font_02_sfnt_off0000e6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C2 19256 bytes
SHA-256: 42c7aa55f16d8e247533481da3013ab3b9b4fa46f668cf53985fcdee0a651af3

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