Malicious PDF — malware analysis report

Static analysis result for SHA-256 50009fed21c22cdd…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 02:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5369d1ad41e80c2f1f217c300969c423 SHA-1: 9028a41c7cc38a05abd4485574665901f7674a35 SHA-256: 50009fed21c22cdddb66c59e67cfc86c50f083de4951f199dc3fa933100e835e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=final+fantasy+4+android+walkthrough PDF link annotation
    • https://indiantalentjunction.com/milan/media/bexaz.pdfIn PDF document text
    • https://redengewinnt.com/userfiles/file/pokuzuwepe.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/lumazefegajixawotonu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/riuot8ruh0qkufep1giu6h60ks/kubuxaxusosanumesi.pdfIn PDF document text
    • https://hnhaa.com/userfiles/tnejp/files/zuledas.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/vavidakemapedeworobamiw.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d94c364c---xufiravaxenonuxamil.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109071313418910.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/8282398551.pdfIn PDF document text
    • http://makaroma.fr/upload/file/35327535546.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/92594508775.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/dewisava.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/gewum.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/xuvepuvekijap.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/pamunurasisovisew.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/noliz.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/jawidijotipijumofo.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/76396516673.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40015917637.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d32adfd1---vonufapifatiru.pdfIn PDF document text
    • http://vanhacollection.com/images/files/nenurusumezenew.pdfIn PDF document text
    • https://fishboat.hr/files/76441054810.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/34680626924.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/kuwavolimekadapojukixogi.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/nifidu.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_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39C 17500 bytes
SHA-256: 8746a5e7c74d782e1381ccf07a6019bd8038f1306565480350ee20590d91cb91
font_02_sfnt_off0001215a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215A 10948 bytes
SHA-256: 629d4c6784cfb4295ded6ccd95d55cb866e00f11e311e5cc340d339fb5df6423

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