Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eae3dcb6a3acf51…

MALICIOUS

PDF

82.9 KB Created: 2021-09-10 11:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 08ac1725fd8704ee626064174a9ccd3b SHA-1: 793a7f8de08c8dd710cd416a44170824995636d8 SHA-256: 9eae3dcb6a3acf51918a5c8245be46e5ba7c3e491690e88745285e309aa73008
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to external websites, including those hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting further supports a malicious purpose.

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://malayalamfoundation.org/admin/my_files/file/27415136895.pdf In PDF document text
    • http://tongkhomica.com/upload/files/gakedirit.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/jekukixetofibe.pdfIn PDF document text
    • http://maxbrio.kr/files/files/33490246324.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/37953884468.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/174821042.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/86068391921.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613072e7c7b78---jatakil.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/49980141210.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161363824ba42c---vukodofirogatovoxabivoje.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133793238d73---82405611864.pdfIn PDF document text
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/zerifuxibetad.pdfIn PDF document text
    • http://baove24h.org/upload/files/83113087040.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/53218980174.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96755787890.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/famufar.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/63337221912.pdfIn PDF document text
    • http://abriganature.centralcms.cloud/galeria/files/5072510124.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doboxagozalerunexibize.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab6cc4f69---79572161502.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/lilebelojo.pdfIn PDF document text
    • https://onecre.com/images/content/files/pakimur.pdfIn PDF document text
    • http://elitsatodorova.com/uploadfiles/file/95646958787.pdfIn PDF document text
    • https://signika.pl/Upload/file/79007843707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bus+wala+game+bus+wala+game+bus+wala+game+bus+wala+gamePDF 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_off0000de92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE92 18084 bytes
SHA-256: fc94d23db28447220a53d4ebc2d5640b3ac501d7249db3acbef63791fbe88e7d
font_01_sfnt_off00010d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10316 bytes
SHA-256: c269e5f60b4f2714f259759105554e77b1b4afaf9c938bda0d7637e1816d9390
font_02_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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