Malicious PDF — malware analysis report

Static analysis result for SHA-256 355d4d9b1dda84bd…

MALICIOUS

PDF

81.2 KB Created: 2021-09-18 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75d07bad3a19aeca19736ac1a2614faf SHA-1: 424d65f7d9766f37dff93dd1fa85faa47938499d SHA-256: 355d4d9b1dda84bd4e9901390889dcd5eb848ddfe1290a91f072ccb866d9c08c
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using non-clustered link farms on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of further payloads via the embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://inwebjor.ru/uplcv?utm_term=watch+dogs+2+apk+download+for+android PDF link annotation
    • http://wsm.hk/images/uploadfiles/file/38679912285.pdfIn PDF document text
    • https://kratky.eu/files/file/92601476792.pdfIn PDF document text
    • http://phelieuviethung.vn/upload/files/vexoxilodepitajopajise.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/maveloku.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/getomefilikoxokino.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/gitulevarufurekum.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/nemuxen.pdfIn PDF document text
    • http://tiendanatacion.com/noticias/files/90220615659.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/94118805053.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/26714382546.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/bifupegor.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/fijirebifozirulidowozifu.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-9/20210909033650155297.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/woboloxinoduvew.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/38f0jq0n1avat5d302hnobnel8/80539973759.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614167eaafe90---54919965270.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/77138118299.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/natizasak.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/marurixizu.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/68924092825.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/d7571dcfbd36c9a0f18eeba498f43d2e/15174596865.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/xirefiwebiwetolita.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210914032448.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/39f927f187ac3026a6a0e38a7d13cf5c/bekedalolukomamip.pdfIn PDF document text
    • 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_off0000d863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD863 17784 bytes
SHA-256: f8302098973b2015eb8ef1299b821fa119471b5c292a0567681f9c1331b2a71b
font_01_sfnt_off00010582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10582 11060 bytes
SHA-256: dc7f554bf7db45e5fef6020f555e637bb7c490a86b68fcef25e13c3805bbced5
font_02_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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