Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7822806b34214f0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-03 17:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cca66b8dd096f8dcc8a0629484977d7d SHA-1: c4f7619fa48af59a213368f45c8502af59228268 SHA-256: e7822806b34214f0f1d159dfe35e22c78be727f10d31f55a11e7de5be452d240
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised websites or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://wastran.ru/uplcv?utm_term=mean+average+worksheet+ks2 PDF link annotation
    • http://www.sudaff.com/pics/file/58024432252.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/90329580028.pdfIn PDF document text
    • http://euhoca.com/js/ckfinder/userfiles/files/guvosibovip.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/64457055841.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f052c74a54---wijij.pdfIn PDF document text
    • https://gangnampools.com/contents//files/sejibufojima.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/zetozijurozugawu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8nu7tlqlmbij9gkpb1u06v6v6a/wadunubixu.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/fg77pl0l527i276ucmt609nk66/54313974059.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vutilusorivajotafule.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/zagewafazenirewurab.pdfIn PDF document text
    • http://1959blackshirts.com/clients/866684/File/86176316994.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/219e7fa2b43476a5c7aa9663f34392f6/94870729426.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210508171455791181488.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb450ace7---putodijewel.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b90437783f5---7562883832.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/wixezonavewokajuninomako.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca9e3798b.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/s60ls8opqohlrdjktcgnj7iv70/53016458777.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/eb361da0dd268facf67753d0207b88ed/82493707306.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/1115kk6olgpuu5667ju41mlh63/82070886107.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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 19000 bytes
SHA-256: 8d5645f29a86ef04e7badda366c302dc4bb073ca176805688cd7b46ffcb210a0
font_01_sfnt_off00011472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 10608 bytes
SHA-256: 1554366d387305293ca0b037cf8220f6b9d4734071ca402f3b7f5baafc51560f

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