Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e2364ef0875882…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 22:31:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc7851e274916d63f5d482c4374589ca SHA-1: 5163c8b6afd0c3f250b445cdbf050853de5dd951 SHA-256: d4e2364ef0875882931613e67af7226619cbc47dd30c05231c593fa91f695001
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 potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on distinct hosts, suggesting an attempt to manipulate search engine rankings or distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://iwanbim.com/userfiles/files/61527644945.pdf
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/pixivosoxorowixuwex.pdf
    • https://pachetedeturism.ro/images/files/30774275017.pdf
    • http://charontrade.hu/data/file/78485530901.pdf
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/serejuragitawubabab.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/39969185231.pdf
    • https://currenwatch.myhost360.cn/file/upload/files/09-04-15-32-36-33.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/52153dddf8d693d2946668fd31055868/55489680269.pdf
    • http://athaj2.specialty-match.com/upload/files/kobaloru.pdf
    • http://voijin.com/userfiles/files/90263065540.pdf
    • https://amrapalispot.com/userfiles/file/4522290175.pdf
    • http://ciaooo.ru/uploades/userfiles/file/4634922719.pdf
    • https://onlinendttraining.net/files/fedofarasifow.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e2d360529---jukodidowiboxuzejozagari.pdf
    • http://kite-surf.sk/files/nirujelamarovagifemisepu.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614033d14f89d---35237781511.pdf
    • https://cochleartudaskozpont.hu/files/zuvukidavuxezivazam.pdf
    • http://faithleader.org/js/ckfinder/userfiles/files/767798275.pdf
    • http://xaydunglenguyen.vn/upload/files/42a4a7.pdf
    • https://rimi.sk/userfiles/file/31798542401.pdf
    • http://thuocamakong.net/userfiles/image/file/vajuronixebetupa.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5c4d6607---rawovofejisilaxezabek.pdf
    • http://kovacsoltvaskerites.hu/images/file/fogimafifotarowirigidu.pdf
    • http://1hozain.ru/files/userfiles/files/29588504805.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/begezemunafakudobove.pdf
    • https://spandoekland.nl/userfiles/file/zarilegerivawenimozalumo.pdf
    • http://edisonprivateschoolbeta.com/cote_dor_import/admin/ckfinder/userfiles/files/luxewiraki.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/161449828569b3---51282732090.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tubidy+blue+mp3+music+downloader
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d89c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD89C 16792 bytes
font_01_sfnt_off0000f0b3.bin
15a065261a84beba63bf79e632ced7022815b930f988bb1cd43825f9a6173696
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B3 11152 bytes
font_02_sfnt_off00010a8d.bin
b824863cc5b014f6d3c14661db1da16e89408577b228b3110dd00110f16e8fce
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8D 17836 bytes