Malicious PDF — malware analysis report

Static analysis result for SHA-256 477212363bbdae01…

MALICIOUS

PDF

79.8 KB Created: 2021-09-20 13:17:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dd925cf2c49948cf63e6d012a02e2ae SHA-1: 9d2faf7fab3ad21362eb0bb3c0e6331c00306ab4 SHA-256: 477212363bbdae019be96fddb13939a6121184ae17a3085aead45c01510a72c8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs suggests an attempt to lure users to potentially harmful sites. Although no scripts were directly extracted, the nature of the URLs and the heuristic firings suggest a malicious intent to distribute or phish.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://queure.ru/uplcv?utm_term=sim+sms+recovery+software+free PDF link annotation
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tilif.pdfIn PDF document text
    • http://mextro.de/upload/files/70488585435.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/kodubok.pdfIn PDF document text
    • http://kbidc.kr/upload/editor/file/1631642515.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/81772098358.pdfIn PDF document text
    • http://handinks.com/ckfinder/images_store/files/52274532452.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/parenudapu.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/37430463130.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/guwilenedaz.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/70597893211.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/mopetefozevukudiziderazil.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/wiwubapubulojazagowig.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/guwevine.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/dobasisulesaketulitufi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140916d6eb88---xewexiz.pdfIn PDF document text
    • http://agrihitech.net/media/ftp/file/35318940081.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/rixetaredilemonake.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/855afeb856317b55e3dc521bab4ad095/pulofo.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/pafuganivuzobawide.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/3148595472.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/rutijalawu.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/gajivizevapodesexipu.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/guwoko.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f4d5d27c8---17784351016.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_off0000d3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D1 17248 bytes
SHA-256: fa934b9a87efcad77d24c2588c639ae8a56ae43a457c0841cf805b49cc3acf13
font_01_sfnt_off000100c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C7 10688 bytes
SHA-256: da02e7f6b4a40a1d0893ff6acd28777d04dae2379348cada10f1c92889be9ce2
font_02_sfnt_off00011968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1