Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cc05359849c778…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 03:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f928e23fda0fdd39027662b2501bb376 SHA-1: 0582a177a23e258162c51ca648d0043b9b71dd53 SHA-256: c8cc05359849c778cef895a711e7588c5af19b9db83bcf158ae44ec2bc85cd91
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating it likely contains malicious content. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS upload directories or disposable domains. This pattern suggests an attempt to lure users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://td-mg.ru/uploads/files/97993810943.pdf In PDF document text
    • http://ck-buhgalter.ru/userfiles/file/1543048691.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6b0c15132---793071340.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a7710accd---pakosetoviranesulovijini.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/wasugekusenosugemepid.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c2432ebf1---nidexoxujilanoduwid.pdfIn PDF document text
    • http://selidbe-beograd.info/files/wulanelizuforuburawe.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184c07cf8c---14486731123.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/zonubizosepiwivas.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/tibitiketi.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/46115004843.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/3964734825.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///22262565019.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/48225024296.pdfIn PDF document text
    • http://atrsara.ir/resource/files/wudixolekonubiwusoz.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/nepofu.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/puriposumopifirenapaba.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///64077616864.pdfIn PDF document text
    • https://phoenixturkey.com/upload/ckfinder/files/9244513659.pdfIn PDF document text
    • http://saga.diamonds/uploads/ckfinder/files/16907595393.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/xivewobaretalaw.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/82669378313.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139103f9529d---rupebofojas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+make+a+tiktok+video+as+your+wallpaperPDF 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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 10896 bytes
SHA-256: 4335d53eac2427c3617efc334c6bd3386e926a9a6dee4fd61abae2a6d32a4757
font_02_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16108 bytes
SHA-256: f6906bfaba420fe4f91ae1f6fcf9d8f5da2809cac6aaf452f020bad1f343642d

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