Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fcf63b6f0d9e6d…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 20:22:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c0b876373ec28c297df18665f8b0c90c SHA-1: 401ca464217799aa3d2ae0c3fd1daacecb4f98c0 SHA-256: 98fcf63b6f0d9e6d35db2196edca842a7a076c4096decf78840954bbf1d22405
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many pointing to compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern observed is the use of a link farm to redirect users to potentially malicious content, leveraging compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://ms01bet.net/contents//files/3205130436.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/litoduzojonafebuku.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b836e6a6097---lipoduxojamewurapabatitip.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be656713f8---33673006524.pdf
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/h7uv2e80ahhkef4bfhp57frv98/vesizok.pdf
    • http://geologocarmignani.com/userfiles/files/46160461368.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/4gclv72cep1rlgfbtup4oacgoj/78992029174.pdf
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/goganowigora.pdf
    • http://gwardiajuvenia.pl/zdjecia/fck/file/65847776022.pdf
    • https://anmimar.com/royal/userfiles/file/93196537077.pdf
    • https://tipresentoio.it/images/file/xegaduvadomewonerikajori.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/19924134789.pdf
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/88650906095.pdf
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd57e42a05---budoj.pdf
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/01db3dc7fdd0f7787b30b21e5525af33/fupiwet.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/e4mfsgmo78ht0s4liim97f66l4/99181719726.pdf
    • https://rainbowfurnitures.com/files/files/65241797863.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffbef023c9---40526913598.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d46ad48cbd5d16bac4736105a01670e6/45007310526.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160a41ba87e609---kewiwudevox.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c23bc36b9---93281876476.pdf
    • http://giadinhlaurenso.org/upload/files/kazor.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608af4378d9e2---pijamejelonikopuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=hail+to+the+king+baby+evil+dead
    • 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_off0000f366.bin
8616e35774f15fb146e0dc79b5cf24d9703649d40b82e6f56150003e15948f46
pdf-font-stream PDF embedded font (sfnt) at offset 0xF366 16500 bytes
font_01_sfnt_off00011dd5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD5 16792 bytes
font_02_sfnt_off000135ec.bin
f681878467d1c4a20f050100e24e4bcc65af6b2aab7a5de2002d333c47444b90
pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 10660 bytes