Malicious PDF — malware analysis report

Static analysis result for SHA-256 b555365eeaa464b3…

MALICIOUS

PDF

83.0 KB Created: 2021-09-24 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d1fd17e8fa3786889f637865f1be9bff SHA-1: 82cef16a9b78aed4d2046daca2f525caf988f4f4 SHA-256: b555365eeaa464b3b2ad1fa9b4f8457be184e7c2877b23059236c37d00122078
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to external websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, suggesting the PDF is designed to leverage search engine optimization or compromised infrastructure to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://coretry.ru/uplcv?utm_term=most+haunted+game+in+play+store PDF link annotation
    • http://zjqzzx.com/uploadfile/file/2021090122164973499.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/46082851639.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/rokopozamizenefamof.pdfIn PDF document text
    • https://felicityokolo.com/file/dimugipeladegezon.pdfIn PDF document text
    • http://hypovyhody.sk/res/file/47474261490.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/2162415310.pdfIn PDF document text
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/bajoxixala.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16148e16e80d0c---fusolifunatabuzovobig.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/c14e8253d107d86f1b82d737f1b1c07b/82068789290.pdfIn PDF document text
    • http://www.520amis.com/upload/files/38668806741.pdfIn PDF document text
    • https://stauber.lt/images/files/kodiwalepetuxemokuwateto.pdfIn PDF document text
    • http://napiarsaigh.com/images/71881196304.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/79467275866.pdfIn PDF document text
    • http://mexxeopaint.com/upload/files/xulaxupojulikume.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/63649379809.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446a60aa4cf---favisig.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/gejezebozuko.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/petejinorutezop.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1631377855.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/lelusibi.pdfIn PDF document text
    • http://llux.vn/uploads/files/jadekasojudunobewawovo.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161488b001c38d---zuvasitixijixojabeleno.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/batogiso.pdfIn PDF document text
    • http://01host.ru/userfiles/files/samuvudajo.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/faxoxubesusa.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/soxunipuxidawozonifufoval.pdfIn PDF document text
    • https://buyafranchise.org/files/files/fotawexuvuram.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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 11044 bytes
SHA-256: cbc61c37b23a60430c3b136b63e83ea0ab3f78efe209b8b972b1aca5f950ec0a
font_01_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4C 17956 bytes
SHA-256: 728bcce10c997f876728e8d5d2881c8675afd8aa6431c6ad12fe61e2ed17dcf3

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