Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec97ea3c24f703f…

MALICIOUS

PDF

95.5 KB Created: 2021-08-12 02:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 98ca7acf3de9f7d744d1f8ce78bec076 SHA-1: 9e55c623d3618bdf1d25d1ca9a50d36c394fe2bb SHA-256: eec97ea3c24f703f7fbf3b9d1e820ee792321aa06cc4ddbdb3c4ac129ab0d913
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://allytemp.ru/uplcv?utm_term=how+to+reset+medibang+paint+pro PDF link annotation
    • http://nhhs78.org/clients/63854/File/nuzekefekinaze.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/alevu5qlfohlr5uo57id2h752r/lubonapazilapazuvufip.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89658dedbd---fivonunawiwaneka.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/83062988258.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/keputexobizagirawodo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/97842881846.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/29334980087.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/rexiduzotuvagawewezazel.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/58e65e2200406356537066c290218c5f/98414815015.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/f787d3d5bbb6427f8035ea3ff58a5143/lijotelesevubona.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/05211b91f3f1fe3703ef9f8ede3cf2cc/xiwemuxamubavow.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/xogonaligen.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e6effe185a31e144f49470bafc83583a/kibozofunotinuromokeg.pdfIn PDF document text
    • http://chromoink.com/updates/file/98349099276.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8cdf13ce86---20454660754.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/gomejo.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/balazajovowinam.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/6grgoaf8h1ut8idi52pu9n47h0/6486908051.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/tezajijuso.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a3ab12dda---wileb.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/reforepidevigula.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a64e60449---gezejipubi.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/3kg45lrp8fb2non6j9c9a9km63/pomopusaw.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/97a8d26bbade8105afdc59aa976b801d/77524806956.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 17212 bytes
SHA-256: ab9448a5727365454708f11ff2bf476ca2fdba10cb013b5ff81d8d145aabe21e
font_02_sfnt_off00011f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F84 17524 bytes
SHA-256: 2c957ed646483f066a00027a6ff524255979d2c3a5d03bb09e76ed3e81adc03d
font_03_sfnt_off00014d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D89 1892 bytes
SHA-256: 5a2cb08840a1a55b29974b71e4b41ac3a11fec7b1b4ad3bd0b6d49b5a4b5c6b8
font_04_sfnt_off00015637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15637 10904 bytes
SHA-256: d955a3c4af22df5ff0dd509fd0c2b56083f537e371506ed578665ea451e80d15

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