Malicious PDF — malware analysis report

Static analysis result for SHA-256 115bcbf75cb3ab8a…

MALICIOUS

PDF

96.5 KB Created: 2021-08-26 09:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7d7a71ae78ae00ce7fb89a4c42946ad2 SHA-1: 6576b0a9dbd5b57d8074608a98f3a31cd84536e5 SHA-256: 115bcbf75cb3ab8ac66c3d43b37407aa64589075e4d3348ac887f3959c8a2f6c
164 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, which is a common technique for initiating malicious actions. The file also contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=mathematics+for+competitive+exams+pdf PDF link annotation
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/fukemudirezokegazulenaja.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e455c6dcd22---10577075496.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/guxopagepazovajipojewesup.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/93118903700.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55be41f43b---jamili.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c67c87d4894---pevijas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607607c7ed6dd---desesug.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609906428a87e---gisepajekurarutuxenadumup.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/35648295120.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/rotoragizijilerikiv.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860a13d9b08---masefefomunarexifisu.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160774df44f3ba---vuzulobat.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/70437208957.pdfIn PDF document text
    • http://portalkucharski.pl/app/webroot/media/files/26448211775.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/688f9626e79f3e1ef4c6e0b042aee470/wezezemalumiremuzelixo.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/69312270785.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/1ge9u6ldj0k72gq7oldgrq7ge6/vogunomemolirineraz.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/df38ad4ffcaef96c92bdeb619c220aac/70063595609.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/besuvakate.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d49da1a419e---lalobewokaxuj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/74537968303.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/qauivu9bksg6na0h295q8gs7f4/vatalubebekenikife.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_off00010d38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D38 19704 bytes
SHA-256: b486784e2674e3aff7b8baced2fe15d2859906f775b38c6f7a285ec07c16d0bc
font_01_sfnt_off000141b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B0 10896 bytes
SHA-256: bae0f957ef4dde1ec8871003ea75a3a31a67bc1f36ba0fc89a196128c7a36ede
font_02_sfnt_off00015af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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