Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d142635607747ae…

MALICIOUS

PDF

100.3 KB Created: 2021-08-09 18:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2684936f351570a6553cbde42cb27a7 SHA-1: f1627672199b46466ea3eae6fdfb2217911d77a0 SHA-256: 4d142635607747ae6b7432bada5d71c91f7f293f478b37fe110c09f3ed51cf0f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for SEO manipulation or phishing. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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 https://oniceh.ru/uplcv?utm_term=is+dash+diet+good+for+kidney+disease PDF link annotation
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/a5cdc56b917704c28439e2f4885de99c/bovukiku.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/4f9a8897deb7b3e50bb02841fbd98bc9/nedepi.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/putakezidiritexok.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bedb10bffc7---nimamukajenuvafobisarine.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28246770169.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/6564af0d5205749b9ee087874277e5c7/xuvejofemu.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/kesobire.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160edae0ce1681---xoniwejiwizovito.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/da0a5196806154c11a53c89ac8d99782/kitonakipojabeluvode.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/15563297716.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e8af9719e29eae9ca85ddd0625fb4558/8592769786.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160866a31138ba---82518559221.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/46892433402.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/86885820301.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/26976079205.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/65841153885.pdfIn PDF document text
    • http://getem.plfiles/file/24063952959.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/99279199528.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509404b659---betazapi.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/97386dbf27ab081afe771f3c07c9f3da/rubozogomukejamogob.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/domeretusakelax.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c1518e763---zivapagunugugesutedigib.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e8cf54b13c357b229d787056d99490b2/xekorefilasudokafe.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_off000120cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120CD 10744 bytes
SHA-256: cbb4a1fd578a9bf510c8de74bd4d4fe5edf9ef799aeee3d26d7398c32c1880bc
font_01_sfnt_off00013948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001515a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1515A 18640 bytes
SHA-256: b5695cb691979e90acfe9f4a17604c599618750b2109ff6a4eb61ba07ca44a24

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