Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9ecd17c27b3c57…

MALICIOUS

PDF

87.4 KB Created: 2021-09-17 12:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d2b7a53328434a7a6492bdef1a8b5823 SHA-1: 06db9ea8d549e57d88d67507a36e33e25bb5e562 SHA-256: 6f9ecd17c27b3c57fa3327c17033ab44c1a4160cebb8668fc42c5d686cbbcb88
164 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 websites or disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://allytemp.ru/uplcv?utm_term=android+11+on+mi+a3 PDF link annotation
    • http://hndgyl.com/v15/Upload/file/20219618261510.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/aaaa118610775d342f76390f9031943d/negunefugewade.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210902143253329805g9j7xwe67y1h.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/wazidimoregovikomuli.pdfIn PDF document text
    • http://muszempilla.com/files/file/97094193453.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/tovovudor.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109161753002221.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/sugirofagibibujemar.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/temazegutamulijubo.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/57msve7qlplp7tjnp52fjs0ptv/zidaborawibisomuvesedu.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/14325097964.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/nomatonoviwezapujatovas.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/30417877241.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/fatutukexegipaf.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/zikunonexib.pdfIn PDF document text
    • http://dfanchem.com/upload/files/93246837397.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/22412308097.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/77157222315.pdfIn PDF document text
    • https://termofriz.rs/files/37908888050.pdfIn PDF document text
    • https://bizimpin.com/calisma2/files/uploads/meriruvuzikogisejevuwobe.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/zugorigivoguk.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140befe9e779---51821734933.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-16/20210916123805329419.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090917241392.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/80968031220.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/pomitesowevupuweludobobo.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_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 10172 bytes
SHA-256: 999b461e4be6f2bc2f1d2e819375bb1704794ce9937cdab5865a64a0a99ecc2a
font_01_sfnt_off000108ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EF 17804 bytes
SHA-256: 89fce77059c0780885ccba9a4e09a37fa57b7569e5d02e600c5547113f473857
font_02_sfnt_off000137a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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