Malicious PDF — malware analysis report

Static analysis result for SHA-256 15d77ef94547806c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-24 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6289c074368230b2fac27cb29efd0584 SHA-1: ff69efb064f828ed0d071cee54f4eef82783b066 SHA-256: 15d77ef94547806c1c78cc201823476cebaeb5298a8b3470a54fca017630026e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and compromised upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=fire+protection+minecraft PDF link annotation
    • http://eqletstalk.com/uploads/files/202109102253273434.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/12648547663.pdfIn PDF document text
    • http://radiopoint.cz/userfiles/file/11395111981.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f47512d1a55f245fbc3daffc883a1014/44847717258.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/40137700792.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/60497729207.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/vunujuvomefi.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/58437528546.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/63006842058.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/gafopolawukaboveximi.pdfIn PDF document text
    • https://msiutilities.net/documents/zifopid.pdfIn PDF document text
    • https://aedwea.com/upload/foto/43314355014.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-9/20210909081324413020.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1f53da786---tovajemizobinisag.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/99799784838.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/52123175866.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/68937dcc0c2eb0ecfccdbe083b362514/1289695133.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/61152513107.pdfIn PDF document text
    • http://udokutscher.de/gfx/userfiles/files/munugozepufovof.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/13499775749.pdfIn PDF document text
    • http://inciboya.com/resimler/site/files/87774921096.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/90557778943.pdfIn PDF document text
    • http://silver1979.com/upload/file/guduragusolufa.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/tiritalikebinogofetunolab.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_off0000d2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FA 10404 bytes
SHA-256: 695c039f0ca75695dd264d0a1e722eb6ca13bddcc87d12629858ca11bb06c866
font_01_sfnt_off0000ea7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7C 17508 bytes
SHA-256: b59e232cb6e1e36842481c628073f00a569edb9cea86023dabb90ab5ac39fcde
font_02_sfnt_off000118ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1