Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ebbb39fe12f7591…

MALICIOUS

PDF

95.4 KB Created: 2021-06-25 21:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77432eb4164945b891a105ad9a735b2e SHA-1: 28f9b4d2bbff84918e93b46ff54eeae65180356c SHA-256: 5ebbb39fe12f75910d20cca52d68a0f1891f7b3476face2fade447d7b774d218
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The heuristics indicate it functions as a link farm, directing users to various external URLs, including one that appears to be a search query for 'nintendo switch apk android'. The presence of numerous links on disposable hosting and compromised CMS upload storage further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 6

  • 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.
  • 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://infrive.ru/uplcv?utm_term=nintendo+switch+apk+android
    • http://sodrex.pl/userfiles/file/tufafizitageni.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-11/20210511101041138097.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/37186c02e643c31e758a0e4c19a3744e/77938798372.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c190a670a0---refikenesujedofewakejato.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1e86199e---6459022365.pdf
    • https://guruamardaspublicschool.com/userfiles/files/lovijenizomumubarolute.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/7bce9c73002017e71478f2408175a290/45927783026.pdf
    • http://alexdisinfestazioni.com/userfiles/files/12569692687.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/fowawedep.pdf
    • http://onellenorzes.com/uploads/files/rikamuzugibesolaxug.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1b9ed634e6e6b15bbf45fc9525975240/duvuno.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/0b09b5c97b1ff822dd24a8ace3ffe9ae/kilaliw.pdf
    • https://ivanda-commerce.hr/userfiles/file/batijapogozexawoxodi.pdf
    • https://shriayurvednagpur.org/public/ckfinder/userfiles/files/guralivakikipokufulu.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16071e735515df---54655928393.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/89f64eec8d337d0e800d90c761043f3e/57256391848.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/f60c114df471ba9f53ea6f7fd341c5bf/dasisu.pdf
    • http://kath-kiga-bw.de/bilder/berichte/file/kipifusovovi.pdf
    • http://osc-pribor.ru/products_pictures/file/berubuwabimebenufa.pdf
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d32ed726998b0309a6b654b6c25ce6c3/wefosuvojefixowadaraxi.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/949b5166cfa0b74850c7b216bcf11b6f/kixokosuvevetiveg.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883775d956e---nugigelezafefoz.pdf
    • http://alexhofford.com/temp/files/file/wupenug.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986917137cb---zaguzorefupasedinudowa.pdf
    • http://bobas24.pl/Upload/file/mukiwakulepesigegewe.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cca6d77116---fodanasakafovaluvevaxe.pdf
    • 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_off0001115d.bin
8f2a6fe11563611e7c96a91f88d17a9ff796a140d38ed02ab8d0ed7a678e6567		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 17652 bytes
font_01_sfnt_off00013f96.bin
709ebf027cc8d81bfb08c604b316b8d7d0f92ffb2e5d44d90215eeec8a93203b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F96 10720 bytes
font_02_sfnt_off0001583d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1583D 16792 bytes

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