Malicious PDF — malware analysis report

Static analysis result for SHA-256 c503c5b69c4ccc8f…

MALICIOUS

PDF

92.3 KB Created: 2021-06-25 21:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0cd4d4043d61d8c977a3bd61ee3978bc SHA-1: 24ffd1da44555b51e0e0fc6a79b4a573e9e03e89 SHA-256: c503c5b69c4ccc8f5b071f0f83b8b607557603abc5ddb400fdd08f9a0e6c85ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and link farms pointing to potentially compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging T1059.007 (JavaScript) for exploitation if any active content is present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crysiq.ru/uplcv?utm_term=hungry+shark+evolution+unlimited+money+apk
    • http://bulongvungtau.com/media/ftp/file/wukowapamofovinu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8c8ebb5f7---51357371352.pdf
    • http://ajtoablakcentrum.com/_user/file/59541944634.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/7edk7embj4gsfhuj5glj5d0ujl/63760592223.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607659914feb7---39325586027.pdf
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/20957403748.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160814c15170a5---zoxavokakinetimivo.pdf
    • https://foulardfotografando.it/file/junopupo.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/sg4mcsd4v963hg4oo2dcsm1jo7/43688224359.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i0k01icsfcbbi3ud6junu1bjs1/26816660591.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a885a985b---gexesaralofexovusor.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723fda2a907---kuvipusupolaru.pdf
    • http://reclameindex.nl/images/uploads/wakaniwogorarojexixola.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/djv11bn9q9ta3jlagae7bpphm9/79370224699.pdf
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/2b74b2fa3221a9c09cc247d1f36ef525/terixusojipizugek.pdf
    • https://stratasphere.online/userfiles/file/sipexajudabolugonegefije.pdf
    • http://nhandieurangmuoi.com/ckfinder/userfiles/files/71196394149.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a5123ad2ed3---jibuxupeso.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd406b4c88---meninuvenosu.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7894405d4e3986866671a5b046ee99ac/tuwejimesuwinemito.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/poqqi0om6kgrr6i3nmknis5177/mulowitesumibaguwubut.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/3a1b564d722cf4040fd1bbab2b23de25/70184076036.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a2e6198c8af36108f4f8919b729c2cbc/buwuzunuxobuzatazabutik.pdf
    • http://pomocnaukowa.net/Upload/file/panomos.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f62b3d5694---10197298238.pdf
    • https://familienbilstrup.dk/userfiles/file/9074834489.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_off0000f5df.bin
672fcc8acf0793b9926ac8fa72bab3cc3205bb6e6a750d448377a1b7880adac2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DF 11200 bytes
font_01_sfnt_off00010faa.bin
455da27e44eca43caca9b998b53fabbe2c1585627904a20b9aea5134bdb5bf30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 29768 bytes
font_02_sfnt_off000149c6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149C6 16792 bytes

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