Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6723c99888c4068…

MALICIOUS

PDF

92.5 KB Created: 2021-09-21 19:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7abf9f99b1976ff1a7049665ab224f06 SHA-1: ad699b2ab9a867475269fec8f7dd105af8e6edda SHA-256: b6723c99888c40680d6afa3eaf67c0df5789656e4d06c7733becf07326613dec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The presence of embedded JavaScript further indicates potential malicious activity, likely to facilitate redirection or exploit vulnerabilities. The ClamAV detection and ML classifier strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://catamma.ru/uplcv?utm_term=idol+party+mod+apk+auto+perfect PDF link annotation
    • http://bukhatirhomes.com/userfiles/file/62968214031.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/paberutugesavopame.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/wipugaxuxokekogav.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/75483699513.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/90914746137.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16147d1cec9b2f---fovufedofi.pdfIn PDF document text
    • http://dataction.org/demo/dataction/media/lusuloniselu.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/nivomomodi.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/17381105403.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/0i3imvut1rbkg9d7t0tkan18l3/66412471793.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/luwakijidafenupovowe.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/45c6c9d3feef37172c4bb2dae754c203/xatifomu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148706dcc84f---jifobivegubevenitirabaxep.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/65216189839.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904050810929686.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/27010086797.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/45669087632.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/jugotomivujit.pdfIn PDF document text
    • https://ibextrail.com/editor-images/97649356426.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/43960605777.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/94488791130.pdfIn PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/rapopikudegojelose.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/92739723999.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c
font_01_sfnt_off0000e303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE303 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1A 10672 bytes
SHA-256: ddb8f3e63e99d7b85b5c3cfd786e642ffd6f306c11d7634b46f7d5f907993940
font_03_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 22752 bytes
SHA-256: 92bf7888ee72c9cfe9d96d82ee24eac3b3389370aabe7ac367cfb77f37e22ed0
font_04_sfnt_off00014d9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D9B 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d

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