Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15f6b1df6b453f3…

MALICIOUS

PDF

76.3 KB Created: 2021-09-12 04:03:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7a5d8b4add24d2f80446bfe0a9600970 SHA-1: 3d684a3d4b125af958df4ae697f899e15ed99cf4 SHA-256: d15f6b1df6b453f385e60f2a46b4ca0ed1cf25e41d3185aa4d65759266b02cbc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggest an attempt to redirect users to malicious content. The primary function appears to be acting as a link farm to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://irlanc.ru/uplcv?utm_term=flashlight+permission+android PDF link annotation
    • https://silatur.com/js/ckfinder/userfiles/files/98048663743.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161302c982d6ab---90494096565.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/10226699716.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f923f83f51---nakabipif.pdfIn PDF document text
    • http://kimhoatra.com/upload/fckimagesfile/24333945817.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a80ee38330---47292351725.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/69288881157.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/a2qirmhquh1tt4ghc63d0lgff4/30621519149.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335e1b240e8---lekesitimikokaxewatafider.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/5qcn2enr954tsvfvl3qttar8jl/11930747954.pdfIn PDF document text
    • http://synhbio.com/upload/files/pejimedowupolosubelosoniz.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/50031804672.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dufof.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/jojimedurekulukev.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/10617120609.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/sotelotob.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f63a03692---ziwalaxafowuzonogolox.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/wadezemomideminoxo.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/65410097292.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pebadi.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/74891240916.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/9829276749.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/87694217348.pdfIn PDF document text
    • https://subded.org/userfiles/file/magutasoz.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/fevotikojamegoxu.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_off0000c57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC57F 17708 bytes
SHA-256: 84b9d430e2b418eceb0abac87505c692adb3b711bdb5dcfbfc207b4bc99ab1f5
font_01_sfnt_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 10816 bytes
SHA-256: 5a28b7a60abed187afdccaf342cdb47e7f8d5a84085ba66293579d44b62578cf
font_02_sfnt_off00010bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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