Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee4ca4389cd9271d…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 04:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b21b91b95c5d6ef645168abfd612550d SHA-1: 378b7bcd1fec899ee2bc2135414f900ced304da6 SHA-256: ee4ca4389cd9271da704014a3bf54f98fda67bd4a6075bd71f851cca58976c49
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate that this is likely a link farm designed to distribute malicious content or phish users. The presence of embedded JavaScript, flagged by 'PDF_JS', suggests potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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://vietrocknet.org/app/webroot/img/files/35734591971.pdf In PDF document text
    • http://omonetach.pl/foto/ilustracje/file/savufelevumawuxilamuk.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/21181468283.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/palapademusogezotawakej.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/nulututonilo.pdfIn PDF document text
    • https://bookmyexcellence.com/bookmyexcellence/js/ckfinder/userfiles/files/karuguso.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/34076808058.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/6ks58kkhibbvth792v2c7p4qgg/gikarefamepezoxegawe.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/zanavasu.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161342d9e40b0e---66496956183.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/64463255031.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/xanawogozebolikizesav.pdfIn PDF document text
    • http://numismatika-nbkpdy.cz/userfiles/file/mebema.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/421453612.pdfIn PDF document text
    • http://mrcubezpieczenia.pl/app/webroot/media/files/nujemumezu.pdfIn PDF document text
    • http://smogy.ru/files/files/silolidejalen.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/2a592b994d93a7bab98531c7930fbfab/kerejanogoruvakapupup.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613244fc929e8---52678833651.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/53495595394.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/82995794491.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16139368755271---46977906697.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/98767835889.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/madikosin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lecteur+mp3+pour+tablette+androidPDF 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_off0000d75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75A 10876 bytes
SHA-256: 58ccec098e719a6ea9fd26d73b2295470b725887df0807cca056a215542b854a
font_01_sfnt_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 18336 bytes
SHA-256: 4ad29bd7cff772b68313a2d1d369106592b17576aa1eb4068247ca6e8382c7ee
font_02_sfnt_off00011e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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