Malicious PDF — malware analysis report

Static analysis result for SHA-256 19996bdaed08bfb7…

MALICIOUS

PDF

86.8 KB Created: 2021-09-12 06:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 781e9e5976f833865505e5ed57031efa SHA-1: a01a33f957e83f7fd8febd6f608d0e8e6ae2d1aa SHA-256: 19996bdaed08bfb7e3665549947331684187150600cadf9bcd7e3e83fe795f3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://catamma.ru/uplcv?utm_term=android+tablet+second+monitor PDF link annotation
    • http://sanmorales.es/userfiles/files/vaxem.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/morotolatizosunize.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371c3e4f993---dokazisawijekefomogixam.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d48e08b43---xikife.pdfIn PDF document text
    • https://tckontrola.hr/files/nokejupujebujofovuxesun.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/fusirijajilowedejuwumir.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/fepenepatabifaxalud.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/tumigoxixejoneserisuvifi.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/86605921278.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c151d130f5---58014602206.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/45208329263.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/39520579545.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/82476223896.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/57052255529.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/91283066511.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/liremifelew.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/milemigexogezilelav.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/xuwubamazaz.pdfIn PDF document text
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/fekodaleniginuzos.pdfIn PDF document text
    • http://195exim.com/datas/files/vadakufedamumusujinex.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/73228400869.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1631178394tJsB.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/legisubug.pdfIn PDF document text
    • http://kxqcgs.com/filespath/files/20210905015001.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 10652 bytes
SHA-256: 4aed8549392bfa061a9ea15f7df134aa715161a7132aa0a5b2a1728330ad8984
font_01_sfnt_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 18136 bytes
SHA-256: bd04c01160889849decf68fa9238911005b19e2f163235f193faa6dacadff31a
font_02_sfnt_off00013584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1