Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5670c16deb8eec9…

MALICIOUS

PDF

93.6 KB Created: 2021-07-04 20:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e4863b94eca31461c213df17a069a84 SHA-1: 92fc7c3d511de4ea56bbcabaf849a5e821548325 SHA-256: d5670c16deb8eec93b79be944dae4ac2c2c130a26a217ceb840af4362e4700e7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=are+all+absolute+value+functions+even
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/329d7aef0bf1ef99673d20cdbaffcfc9/36223255107.pdf
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/hb9judse8qfmtq7v6n32f7tegu/dexeduwalotar.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c08d9fc9e47---gadatejozodobow.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c4febd9fd47---vazaxawejozafametomukabi.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/ee3372f27a62ff62db73a5a0d2272b62/96219593281.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/a3f56c5f89691bfd1cdc28df8449b1c2/64055465285.pdf
    • https://bomberosdenavarra.com/userfiles_nexo/files/kekepilipax.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a19dbacfc11---vivaniseboxuw.pdf
    • http://ingpiazza.eu/userfiles/files/24586427344.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608a533f722b8---3473974859.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16093b05854edb---96658654203.pdf
    • https://nhathuydesign.com/wp-content/plugins/super-forms/uploads/php/files/073r7rulguifdb2jiddhg2o8r9/xitefewigesevuvamiweka.pdf
    • http://colorfusion.us/admin/images/file/51455651991.pdf
    • https://aashianarealty.com/file/10763998232.pdf
    • http://goraku-sangyo.com/userfiles/file/53683368834.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fa8a7eb9586b5027e222b828c8d02f6e/49715218550.pdf
    • https://atcotourismtravel.com/userfiles/file/serabafubipenanuxitupije.pdf
    • https://hotnews.md/upload/userfiles/files/71148464291.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/6920b0jlg8lbaoroh6qg6m3bf9/fivuzojitodefenebojeb.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/pewipolewijepefataworuna.pdf
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/27920066251.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/gerepewawo.pdf
    • https://tiklatakip.com/calisma2/files/uploads/tewoputodejeziwegisetuje.pdf
    • http://familiegravesen.dk/ckfinder/userfiles/files/70662873083.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f23e449914afa42fc8b9fc1f1f0e1f64/45211336571.pdf
    • http://riversedgefm.com/files/file/91126695674.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_off0001055a.bin
8c9ea6b729f5f1fd68b036c57938cc0e8c395deb552ed39ee6f5c1e5b99d04cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x1055A 10616 bytes
font_01_sfnt_off00011dcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 16792 bytes
font_02_sfnt_off000135e1.bin
d59b7b5cf857358a6695bb2300d7149445bcf701a2523a485909b75d362d0f00
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E1 19368 bytes