Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05044e45fa64de1…

MALICIOUS

PDF

73.9 KB Created: 2021-09-20 20:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5d69334734e1044f59aea316e9f44a5d SHA-1: d1b5e6e4d18926b59ed5ff36dbe1117d7ea05231 SHA-256: c05044e45fa64de1bc8e50f62f410de2cee1a67bafb43ab8f46b0347c46df7f0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=learn+to+fly+2+no+flash+unblocked PDF link annotation
    • http://damnoen.com/ckfinder/pho/files/pamarepubadugasaku.pdfIn PDF document text
    • http://markjfox.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37225558487.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/samufoguxinuz.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f90dabca6---44051949233.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba7fb87c29828c24becb5c1c73ad88d7/80874610931.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/wimuzulaxeb.pdfIn PDF document text
    • http://riph.pl/userfiles/file/kagiluwitapaxumonasodur.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/mototebiripemunivi.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xesumasudewibe.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pabidifupejudu.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/61321365202.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/dewuk.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/xatenuxiwabezeviman.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/punazofunepajupuzivipoper.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/jakulojadufaben.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/34077133242.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/e8c2d5a1b9562c958fef6a8a1d51ad6b/52905364281.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/f8327cf2cc77ac01d99f8d62a2f0be50/puzanesed.pdfIn PDF document text
    • http://sial.pl/galeria/file/15380452318.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/88382421816.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210914081940_1151284210.pdfIn PDF document text
    • http://travellerisland.com/files/tirudutugiruxerupenudimub.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/lusonozasanilatus.pdfIn PDF document text
    • http://portableandcool.com/files/files/7494470613.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_off0000bcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50D 11004 bytes
SHA-256: 85712f5edc85c4e6a861c647ead4e268c15f544ead6ccb0298ed4353de199ed1
font_02_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 16816 bytes
SHA-256: c863ac5d45543dbe48f8cd1cd192be37bdf97fc3c0f2d7e1924ea1438d95f21a

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