Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e7b8e5a03d05de…

MALICIOUS

PDF

69.2 KB Created: 2021-09-10 07:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0ed405fbfe6d67736a95dce3b15f336e SHA-1: a108ffda5f19233e4da048df392fa0355252dcd1 SHA-256: c8e7b8e5a03d05de2952fe42fd755f9c40c34ea3195644b7a1d627ef8fbe0f01
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://sictombbi.fr/ckfinder/userfiles/files/wesubopedumirapifovubuj.pdf In PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/783dda76221b4c9827dcbdd8d070c406/xolivupatexavokivabe.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/pagok.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/gopilejawesatojusipam.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/dulasopeborupotodeselu.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/jawagemeke.pdfIn PDF document text
    • https://brigitte-farner.ch/userfiles/files/dijojifebilefotozolexuj.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/ruwejugugugipekupedupupi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca0d26b8c---83638494315.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/32745107714.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/pitazi.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/muruwuwomanegane.pdfIn PDF document text
    • https://fultoys.com/userfiles/vomupi.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/lenupaxigideberevubumulax.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/48152358950.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/3431123414.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355476613b9---28729157394.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/tivetomasaloforisoravowa.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/biruzejobonaxi.pdfIn PDF document text
    • http://ccshecea.org/upload/files/33831129898.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/64549366102.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/12716548105.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17229319037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=nfs+most+wanted+apk+free+download+for+android+full+versionPDF 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_off0000b1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1BF 10980 bytes
SHA-256: 59935772968ed79b3f809b349bc1be24b5cad797133cfd5975d63fc026675052
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 14280 bytes
SHA-256: 61c9271a22fc59305f31900b02131f52cba9ab49d1272727d838ddfcc5251f79
font_02_sfnt_off0000eec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1