Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f8ee2f6c4da4d0d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 08:09:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 228845e455d5cb61f620e093a21f614f SHA-1: 44adad35795371f2a74c326f9727cf5834ff6e63 SHA-256: 5f8ee2f6c4da4d0d9f8f40d57bb3e0ba87ddad04aa80fe01ac403ad9307391dc
196 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and it contains heuristics indicating a browser update installation lure. The document body is heavily obfuscated, but the presence of embedded URLs and link farms suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the overall pattern points to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://vanrun-it.nl/userfiles/files/novetixijono.pdf In PDF document text
    • http://liebherr-tr.com/userfiles/file/19513804940.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/robomiwimof.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16140275ebd3fb---14997512194.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/76864373640.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/xujobakat.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/jegipexelorofupebusupipa.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/tufivefafujolaliki.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/14182945640.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/pevuwevovutupotadodod.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/61834623585.pdfIn PDF document text
    • http://hasyo.net/files/file/39963104301.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/sewolefok.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/lodajalodevojerakekirurin.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2342191f4---12575008712.pdfIn PDF document text
    • https://safetyhanoi.com/userfiles/file/23875929682.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/86360592675.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa335a9e9---48262209022.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/42860625394.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16145c185ca704---barufovopin.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/boratatugapemivixaxez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=update+chromebook+to+latest+versionPDF 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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 17292 bytes
SHA-256: 79037b461b74e0217d07a76b3ebfeb8dc74454786cddcd4e81b9a702187beb8b
font_01_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 11084 bytes
SHA-256: f553af5cc84dbc68c9b2f3b26334b94f9d44ed04f4ccc6b5424d9dac4ceeeb3a
font_02_sfnt_off00012767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12767 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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