Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c825728f7e9a86…

MALICIOUS

PDF

150.5 KB Created: 2021-09-23 15:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4684fd1132204cdd8dfc0175c5699309 SHA-1: 6f4ab0436c5eb05144efa8431449a9bb2f83bf6e SHA-256: c3c825728f7e9a867ba154c5fda56f97a15a66e208d082884ca154bcac87abdb
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing a second-stage payload. The presence of a link farm and embedded JS suggests an attempt to lure users to malicious sites or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://cl-metalparts.com/d/files/65751504132.pdf In PDF document text
    • https://centrumschoolka.pl/photos/file/39575319172.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161496b7a5f35b---kolojujifupuziku.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/zeluzeraruvofefuka.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/84004498729.pdfIn PDF document text
    • http://apnschool.in/singhania/downloads/file/tumimobijonabezojekasiv.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/tijilemonegufisigunato.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/witoxu.pdfIn PDF document text
    • https://groupits.cm/uploads/fck/file/96606859463.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/3338520534.pdfIn PDF document text
    • http://gearcon-eng.com/file_media/file_image/file/bakutul.pdfIn PDF document text
    • http://winso.tw/userfiles/file/5072322857.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a9c0e6ad72b003f98fea6f195fea408/99845127415.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/vaxuboworodowelagikiwovud.pdfIn PDF document text
    • http://vce34.ru/attachments/file/41947793217.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/45963682859.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161336f76368d8---sibijasinibu.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/vufefovajivefekerom.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/57031308076.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/hs92f0v80agt5vp9ugo6md0eg2/domewivabituvunisen.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/88608e376d023436115f5348ace67aa2/gejamuwuwisup.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/83761108922.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142787bbf4c0---125052045.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mechanics+of+materials+hibbeler+10th+edition+pdf+solutionsPDF 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_off0001e025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E025 21676 bytes
SHA-256: d48b0d8a0ad0a60367c56adbf12858551c85c29ab26d40552a37ec60030d0ece
font_01_sfnt_off0002193c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2193C 11292 bytes
SHA-256: 2aee3d29a5e7c2048f5c7604d94678d0e6c11381b58812daf52e527d65ef17e5
font_02_sfnt_off0002335f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2335F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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