Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e41f81dfd091b4a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 16:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a50cff081572fb694fa53fde44a76c2d SHA-1: 4d1c8fbc9112ba98d17d88c9a4e9333447eb88f6 SHA-256: 2e41f81dfd091b4af65ecf82197ae8571fad3a3adb617794aefb85166c7d7fe4
164 Risk Score

Malware Insights

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

The file is a PDF containing embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to the overall attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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=ensanut+2012+diabetes+pdf PDF link annotation
    • https://iva-vietnam.com/userfiles/file/wedobetojovib.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/katamor.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/60351515268.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/22282106173.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/rixonumafakubuw.pdfIn PDF document text
    • http://amdind.com/userfiles/file/livozegovalodo.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/bamoxapi.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/ridopivipuxozamuxox.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/wesikojukobanunano.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132292624692---wabodorudedovox.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/50673162165.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160d009c97b0ff---97322660417.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/sevofubefuxajag.pdfIn PDF document text
    • http://4bx.pl/public/file/lesakexaludud.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/719355b96fb662de538dcdeda781f217/80872822815.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/uv9nuiljjh8a3jjn45v1ifv4e1/4994775773.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/be694f9cde26d329eabd077049cab6be/bosumadalavemuxedowur.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/91512798489.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608eaef5e84a7---zulusunefukadujalujofuf.pdfIn PDF document text
    • http://jarosi.hu/files/file/52361574644.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/foxojadarerukififulimejen.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/53958907130.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/19253052827.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/58d96ce4a97370bccf4d249af52da627/73309215744.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/1608767509611c50e3293db.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_off0000e79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE79B 10740 bytes
SHA-256: 0fd147363ab7018144b597b23d0e2f48d1dc07494af0d0d8b8329359fffdb02d
font_01_sfnt_off00010046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10046 17136 bytes
SHA-256: 229298e9d3975a4b611481f31a8d64616ab62d2ac2c4a5b3de5216215ba45968
font_02_sfnt_off00012cc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1