Malicious PDF — malware analysis report

Static analysis result for SHA-256 90e7f82e4c583228…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 18:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e74cd468c0829f78bfeedae683008f33 SHA-1: cf4a7e599f8eb2ff0ce9e4c89f854b4bea8d470d SHA-256: 90e7f82e4c583228566608ea7d4bdb66c33b9d6049d0c45cf3a9c84e3867a3ee
136 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a social engineering lure, specifically a browser extension or update installation scam. It contains numerous links to external sites, many hosted on compromised or disposable domains, suggesting a distribution network for malicious content. While no scripts were directly extracted, the presence of embedded URLs and the 'Browser extension / update installation lure' heuristic strongly indicate an attempt to deliver a malicious payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://krisoc.ru/uplcv?utm_term=pentagram+emoji+copy+and+paste PDF link annotation
    • http://hanasushipickup.com/uploads/files/nupeluzoka.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/30683542430.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/26931303822.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/20124648942.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/59307302856.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/difalu.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16140b90ee3373---81027973358.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/37774270355.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/13099860358.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210918_BD66C311D4713E28.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/2c832f81ce1facebae69a1e4a878fc5d/70360001956.pdfIn PDF document text
    • http://hrudolf.com/userfiles/60361567964.pdfIn PDF document text
    • http://client.diffuse.info/files/72379445665.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e17523d60df2318f874323a83e755650/42389372317.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/47151078717.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/40034159968.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/22462606165.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/rumekova.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/84221382293.pdfIn PDF document text
    • http://vietsinphar.com/uploads/files/82044651312.pdfIn PDF document text
    • http://stringladies.cz/userfiles/kisitetijelosojawafanin.pdfIn PDF document text
    • https://alharithiforcameras.com/ckfinder/userfiles/files/sixawevaxetapibovuketazu.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/32277677245.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1630756316.pdfIn PDF document text
    • http://4bx.pl/public/file/febazet.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_off0000d724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD724 17088 bytes
SHA-256: f6ad9cdf30f445dc29fa064e47ce276077bbcc9892adc8e72b7991ae9d11afad
font_01_sfnt_off000102d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 11056 bytes
SHA-256: 09bc44093559aebe43fc9b88e45ea60c2a436b9557d25e7e4898fa32a6a5001b

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