Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c0753d76818582…

MALICIOUS

PDF

89.4 KB Created: 2021-09-17 18:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 996379138b62bd03436bd284000ec50b SHA-1: f8d0fc8c7f144ed5ebbb074d4b2687e4ae92e326 SHA-256: 43c0753d768185822c87438a560fd725bc06a755d7b2be4c384dcb61de460646
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, characteristic of a link farm. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose, which is likely to direct users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://belly.bpv.su/content/files/files/67620641588.pdf
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/konerusetuvejosog.pdf
    • http://montesantangelo.it/files/files/82555556314.pdf
    • http://dcbestwings.com/uploads/files/futofagafa.pdf
    • https://appchecar.com/ckfinder/userfiles/files/4998697828.pdf
    • http://lnshiyue.com/userfiles/file/20210913095709_327616508.pdf
    • http://dailygiasi.com/uploads/userfiles/file/tururiza.pdf
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/53266719077.pdf
    • https://mfdesign.hu/files/file/bematojidazojuwekusiluki.pdf
    • http://chengzechem.com/upload/files/29066623120.pdf
    • http://bhavalaya.org/ckfinder/userfiles/files/12180643487.pdf
    • https://ncsccalgary.com/userfiles/files/dimoj.pdf
    • http://gma.ge/admin/ckeditor/ckfinder/userfiles/files/25941416945.pdf
    • http://abbeytraining.net/userfiles/file/melepiji.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa642c3f7e---96147249454.pdf
    • http://camberwelltaxi.com/survey/userfiles/files/tagagikaligosulubitineno.pdf
    • http://knshzj.com/CKEdit/upload/files/3970887993.pdf
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/40363553519.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/67298149318.pdf
    • https://ooo-kenk.ru/userfiles/file/77999660231.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613023c2dc469---zefaronakesimaba.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/xolezuketotozig.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/f103df45aa9d89461162c2d4c783bbec/31746704295.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=atualizar+samsung+galaxy+tab+gt+p1000
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f70d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16792 bytes
font_01_sfnt_off00010f1f.bin
46e285b8ff7cd8cd0a3fbf810d81b00cb689633d8f71dd7fedb6fdec168a30a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1F 18252 bytes
font_02_sfnt_off00013e2b.bin
6c99e6b6dba58b741ce26ff870ffe26d44f10e67047bb573662ee4f4975f1685		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E2B 11016 bytes

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