Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d65241d37de536c…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 12:48:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e647dfd8c3cd45173852a69daba18150 SHA-1: c543830b9eaf51a145b872d719a9b34200d59f07 SHA-256: 9d65241d37de536c5dcb89c9a83e4648bacd7e3d239c9d5144d5594045db3fd6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and other domains that appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://fincasotilloviejo.es/files/sotillo/_repo/file/dagaxuvexalazuparofiza.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609740bb86b83---fevafezimupozugox.pdf
    • http://afgventuregroup.com/cfiles/file/80073470197.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/b4c32e0cb287d53b01d7c56021bd89e7/74154495530.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rnh21r0s6ttmr0ja0plhuaa9e7/32884479064.pdf
    • http://tuzvedo.hu/elemek/file/14789593958.pdf
    • https://grandhotelbulgaria.com/userfiles/file/26851229152.pdf
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/38252554215.pdf
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/c6daf267c2a21f5a41cb02dca7cfe6d8/99126885448.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/0c5f9e209d7f194d14652d782bef1a96/34928186793.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076c33e6d7fe---bapudaritewera.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c954d7ed234---totanifodomorerasobunoza.pdf
    • http://unseenadventure.com/userfiles/file/87813115297.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb6e728ba2---22514000835.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700818d995c---24775599656.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/jukn5ir6gb8qf3ogna4q5660i3/tulekepogurusadu.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9bc4dd552ad41b6dbd66e919e85e9137/wopajeposebebozavojakenu.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e32461bdff---pebevavopafuwaxosuwetumu.pdf
    • http://dainichiji.com/upload_ckr/files/77965099410.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607059d38886c---retoremuzu.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a028fb3e9e9---36526962291.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/0bf6cb586dbbcf8b07345509806bcd77/vujolulobejejiji.pdf
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/fcd6b2e0990ac3ac00786e351cefc5a1/99915418234.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bba72a2863760db190720368725e851a/25455500971.pdf
    • http://airconbank.com/upload/fckeditor/file/tozowuforedewigisufoloko.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=colours+and+their+meaning+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_off0000ee52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 16792 bytes
font_01_sfnt_off00010664.bin
3c89091a6b52318eaa44a7e4fe1b016fdeeb9a9a8fd106c0dbfd168e9a58596d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10664 16888 bytes
font_02_sfnt_off00013228.bin
f2f85414dad517b10f1da4cc80ff9395f6668211c0b4f04265df99781bbeccd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13228 11076 bytes