Malicious PDF — malware analysis report

Static analysis result for SHA-256 76aaba16f079701b…

MALICIOUS

PDF

82.5 KB Created: 2021-06-26 02:47:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 26cfa6641e38387ff3a4d9eeff894583 SHA-1: 2de094f7a3f68d37cd403985f9b9ff9a21c75550 SHA-256: 76aaba16f079701b48cdac58e9daace5d1b2cbb3f73c62c05a8a10a7f3b8dc7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URI heuristics and link farm indicators further supports a phishing or credential harvesting attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://smidgel.ru/uplcv?utm_term=impossible+sit+up
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/aef34e3cd962c1a4f0f8d9b5d0c2fd18/71260672665.pdf
    • https://parklanehotel.asia/userfiles/file/18553585718.pdf
    • https://volnynaklad.cz/data/file/38276701921.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609849ac35974---55057105732.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807935db8d2---57188277358.pdf
    • http://rana-international.com/userfiles/files/kuwedasapexukod.pdf
    • https://vannordenvastgoed.nl/userfiles/file/93612156274.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/umfbru35d9japlm7pgc6o656mr/76334497816.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1264575aafd356decd2121b8a23e8bb9/vovuzaridupa.pdf
    • http://matsonconstruction.net/userfiles/file/72575206453.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1606f703666f1d---53754538332.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b986c2efe89---27906387680.pdf
    • https://addsfly.com/userfiles/file/35360141368.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf896e554e---towivipurijeke.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/f3112e1c818eb07792e57aca054c30dd/97424242542.pdf
    • http://masini-de-ambalat.ro/images/userfiles/pinutizaresejes.pdf
    • http://ty-universe.com/image/files/20210601_175549.pdf
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/541c92dcc5207f42d65a32a3c797e110/83792150290.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/a735ac9d52976ba0c421540a14fffa2f/79796305335.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/adcb3d0241af63c9d48e4595ceff1547/tupatijaxukazowowo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/4fa494e3a39de4eec27cf56e766c4459/72917824036.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080687c515b0---61465479984.pdf
    • http://gorisum.net/fckeditor/upload_file/file/47448602693.pdf
    • http://classicalgardenornaments.com/uplds/file/14631423072.pdf
    • 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_off0000e21e.bin
a9323592e615e950162a04b51b11fc05de9ce69b870401df2fece4f259b1722c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE21E 17008 bytes
font_01_sfnt_off00010e67.bin
b04ff04d42d22ee53bc73601b7ed9c1e51c265188f4ec528d5a83b84c643806d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E67 10236 bytes
font_02_sfnt_off0001252f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252F 16792 bytes