Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13d9b6299f5abd0…

MALICIOUS

PDF

110.8 KB Created: 2021-09-23 20:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df30cb0fd064e048374770ffd32f730e SHA-1: 8c6aae59bd35bbec46660aa309c3d20ece0cc60e SHA-256: b13d9b6299f5abd073f11f972e23abbd35351c5f8b4876ad1840b35b04bdbefb
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 compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, likely to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=wave+function+pdf PDF link annotation
    • https://asiquim.com/ckfinder/userfiles/files/mefapajulepopima.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613713d95d80b---76748224518.pdfIn PDF document text
    • http://travelport.pl/userfiles/file/14031069934.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/lexinafujewuwevodo.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/38591263719.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/10986709948.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329fc19f7c6---fujozokawidabogoberokuliv.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kovekamifoxuvelupekobi.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/nexedun.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/37758eff12bcdc78e6799ef4df6d7723/62139088024.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/zofakowijozitiwovisato.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/lopesapola.pdfIn PDF document text
    • https://lifo-sea.com/ckfinder/userfiles/files/lidatifumomubavito.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/91335768143.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/81025757619.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/kozudisalilumadowa.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/1031d4e14de28e9c20168dd2cc2917fa/gafiguvisimo.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/borerozopubofuzanedi.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3a564ebc---jebukadelegebiponapobun.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/budesitokugikerasan.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/xulufapafibufebisox.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_off00014374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14374 22396 bytes
SHA-256: 879f35ba0c38a17162d6c04fa46499f3a2f6e322f58377e818d43bdff92d1864
font_01_sfnt_off00017e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E0D 10456 bytes
SHA-256: 7c6ee965520fdbc1399bc3e977f23dbd3eef698d6ee9387a949084d0cc170dba
font_02_sfnt_off000195f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x195F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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