Malicious PDF — malware analysis report

Static analysis result for SHA-256 f292453b3da82fb0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-16 20:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 39929f7780be165c7eb918a58a10b820 SHA-1: e24ca4fef91542a96aa06e0105a23879df150b5f SHA-256: f292453b3da82fb037491e052e317844297ce2617ca6239230c428e5d9dc6e92
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and the PDF contains numerous embedded URLs pointing to compromised websites and disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages, potentially as part of an SEO poisoning or spam campaign. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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://crewmak.ru/uplcv?utm_term=fon+m%C3%BCzik+yapma+program%C4%B1+android PDF link annotation
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6fc31d8188c14e07e3350248946d50b7/fuxuwasekobefuxoz.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/328465782.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161427c32420a4---36518577656.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/38141352463.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/90355797587.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/fijokepakufimo.pdfIn PDF document text
    • http://neteyes.eu/editor_up/dumexitaniwebota.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/7184273339.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/ziruzavim.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/tirewilinilamu.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/wofaviwil.pdfIn PDF document text
    • http://teakdeck.pl/files/file/bajewilusavufiz.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/51600474347.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/loxof.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/2643586634.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/43412620386.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/60304716210.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/96074657900.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/roriwudewalaxizadoterezi.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/34842565527.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b7497de3e---63552567001.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/1faf3604b7a2329f3785c49633a397d4/xutajunivunofiguvelep.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/dikuvepuki.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/54187591527.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_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 10772 bytes
SHA-256: 00888f1cf3ad17552fcd66189ce16c9afc72761b54cfefd15697320df34b0826
font_01_sfnt_off0000f553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF553 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D65 19500 bytes
SHA-256: 0e9ba1085dba3d2ea65519d1f367ea7f2a1062594931e172812110e6c19c3746