Malicious PDF — malware analysis report

Static analysis result for SHA-256 6495906da64db64d…

MALICIOUS

PDF

77.8 KB Created: 2021-09-11 20:06:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2006f856922ff943b16c08ac7e183460 SHA-1: 8a626b5fda8009018a72e56d84b3b190a8838624 SHA-256: 6495906da64db64dd46cd9ed088c162a8cc92908cf7e262bf725b7bf4e2a9b41
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://communeouchamps.fr/userfiles/file/funofutagalafoxumamuta.pdf In PDF document text
    • https://istanajp.com/contents/files/13698954727.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/5993623115.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/71622067737.pdfIn PDF document text
    • http://dzbnf.com/upload/file///22141087840.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/54921852871.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/xarigibifa.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/75793671290.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed8cc315d---88234025750.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/gegiz.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/wofijej.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134920c998a0---nuzafovo.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/fadevaras.pdfIn PDF document text
    • http://www.kevimotor-rock.hu/files/files/zexoperamivopiredorit.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2169dd97df4ee22a51128fe30cce6d69/93380197203.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/kurelevu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/74393543405.pdfIn PDF document text
    • http://kmsenior.org/file/files/65912110690.pdfIn PDF document text
    • http://photofetimages.com/sodoridokil.pdfIn PDF document text
    • http://dentalweek.eu/userfiles/files/kibalunu.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/pukumujogibudawusilizafe.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/60099233556.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/38760370621.pdfIn PDF document text
    • http://coolscape.info/images/files/robudodeworovav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+sdk+29PDF 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_off0000cee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE3 10284 bytes
SHA-256: b731c0b9a50ed9c7592a5019edd53f66c53b48b3f69f22e8e798c2b82ec15b40
font_01_sfnt_off0000e645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE645 16768 bytes
SHA-256: b7596d10789b81aea8858a13c0d9455fe88902970ffe2aeed2eb14dd0b8fa802
font_02_sfnt_off000111ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1