Malicious PDF — malware analysis report

Static analysis result for SHA-256 c557a528f57c40cd…

MALICIOUS

PDF

77.7 KB Created: 2021-09-24 04:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a73dec2caddd93d6344cb1603827dab9 SHA-1: 701ee1ccc7b0ff911e798c1f49fe1a7b5789feb6 SHA-256: c557a528f57c40cdd3356c64fe1ec9c359185de5a4983238e33ce1926f6f5091
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external links, many pointing to compromised or disposable domains, which is indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a secondary payload or phish for credentials. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://dawahcity.com/userfiles/file/zedukiranamuresafurus.pdf In PDF document text
    • http://dulichtantai.com/files/uploaded/files/dutagotagifum.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/17634620926.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8e2d073fa6386cc27c56117fe91fe2e9/xigajunexavo.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/teferaxewizoxafosujabula.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/f2ff22963e36a58da4911c836df5f4b8/pawep.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/53502076562.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/29181096999.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/rafufudujunazobo.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/31457297720.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/sudomorisina.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/66490785694.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c2784c507---desulewijovezitejakara.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/69266071333.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/luwenida.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/49998483704.pdfIn PDF document text
    • http://wohingltd.com/userfiles/mimizanubinumapa.pdfIn PDF document text
    • https://molecult.metallo-tests.ch/sites/web/upload/files/21257852445.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/44338755771.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/patimogogomegunep.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144aedbf03a4---pomotemujedodopegubolipu.pdfIn PDF document text
    • http://voyagerav.com/v15/Upload/file/2021921140579472.pdfIn PDF document text
    • https://ahha.az/userfiles/file/vobigefadesak.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zavotinobubu.pdfIn PDF document text
    • https://ms2oke.com/contents/files/94263186095.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=steve+crown+you+are+great+lyricsPDF link annotation
    • 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_off0000ca2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE241 17548 bytes
SHA-256: 41e951ec24be0c74a82d32515437f9baadf9a47a050ccc90195090aee09e7b18
font_02_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10848 bytes
SHA-256: f33b6e9172e6739fa3240a05a74e3e38a3b03d43d546847515ef24f4f20a8a48

Open this report in the interactive analyzer, or submit your own file for analysis.