Malicious PDF — malware analysis report

Static analysis result for SHA-256 23754c10eb76ed74…

MALICIOUS

PDF

95.1 KB Created: 2021-09-18 18:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c632e1fb28447113c87b2789872c028a SHA-1: afea9e457dc538684e7e41f11cacd45e4600fd0b SHA-256: 23754c10eb76ed7410756b348392643a2fd15b7b13f09fa89e098f476e84e407
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating it's likely a phishing or malware distribution lure. Heuristics indicate the PDF contains a link farm pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the overall structure and URL findings strongly suggest a phishing or exploit delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://togeltop.net/contents/files/wezewu.pdf In PDF document text
    • http://sanga.asia/userData/board/file/3635454486.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/tubol.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210907073001.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/sulozugisu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/bulixureg.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109152204136856.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/2qbssa605c55plb1e4tk15her2/23810449729.pdfIn PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/350603_73212604505.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/76904612217.pdfIn PDF document text
    • https://officialbacknumber.com/editor_up/73469095543.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/19856494948.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/91458324902.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f119ee32c1---tikesorekawotololasiji.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/6868036786.pdfIn PDF document text
    • http://staropolski.net/Upload/file/vexelutanazagagezaj.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/62325960454.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/67856461356.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/pewupewikotidusanakun.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076f17126d---10182712511.pdfIn PDF document text
    • https://webrobogo.hu/kepek/loridutirenirifivos.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210909_CEC47C8F9BB08BEC.pdfIn PDF document text
    • http://crm333.com/documentos/file/7612293210.pdfIn PDF document text
    • http://kammed.com/userfiles/file/murutudadabironitagelumi.pdfIn PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/zaserimevipedala.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=ethos+pathos+logos+orderPDF 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_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001247c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247C 10460 bytes
SHA-256: 55d018fe57776448ee8453e1c3fc6a91d9726e6354dedad3c184a46fd61df929
font_02_sfnt_off00013c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C30 19348 bytes
SHA-256: 15163f9a7bf866e6b8c70453a226180a0bf1bfa68877d100525dd9d2cfef73f9