Malicious PDF — malware analysis report

Static analysis result for SHA-256 2645f4c3a841a51c…

MALICIOUS

PDF

69.9 KB Created: 2021-09-25 19:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22f434a6abfc43b484bbf499ec1f0e06 SHA-1: 0df137541529764c409276d560be2a2633d270cf SHA-256: 2645f4c3a841a51c5c13f38c9d0a665bd44384d1b71f89a1eabff6c43e13944f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports a malicious intent. While no scripts were directly extracted, the nature of the links and the detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://cudicio.it/images/file/43863461017.pdf In PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dipigak.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/tawisivurinixegeno.pdfIn PDF document text
    • http://ipceurope.be/assets/file/38860086666.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/zotodo.pdfIn PDF document text
    • http://purel-biopharm.com/upload/files/8168530348.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/96831876865.pdfIn PDF document text
    • http://slsnn.ru/content/files/23229648472.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161416753d4cf0---wofixuwadajufa.pdfIn PDF document text
    • https://exclusivelimoservice.com/ckfinder/userfiles/files/wofekixike.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/46462579238.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/zafitagutelilezakopobuv.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/zatorotaviwubixinigizibik.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/munitupajenisegigosa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee88e6c6af---64675062737.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161328ae116ad2---xofinisutot.pdfIn PDF document text
    • http://tattooindex.nl/images/uploads/kakobaxemagovezelama.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/gavapuleb.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/52787641834.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/nesubiginerobuvuwosod.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/18155290062.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/kevuzi.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/83448442480.pdfIn PDF document text
    • http://synfarm.com/upload/files/66732948427.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/fuwavevivomolire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vidmate+film+download+appPDF link annotation
    • 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_off0000b2c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C0 10444 bytes
SHA-256: 4b69f42ead319f9236b0a09e6530bbb710ce3e6090af3d4d19f332b5836b4557
font_01_sfnt_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 15040 bytes
SHA-256: 6a0ee4dd07b14804becbef7b380fa9475bb44d8d092e0add52449e3506d6b903
font_02_sfnt_off0000f030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF030 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1