Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7ea904f68da3fd0…

MALICIOUS

PDF

86.1 KB Created: 2021-06-27 22:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1fb916582b121c5c626abc6115b609b0 SHA-1: 103df99858a09b1486802a00ca0aaa31b885436a SHA-256: f7ea904f68da3fd036f04c5192eaff2ac5639df74dc4efa57973081b8e2c6e29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

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 http://cukierniabrzezinski.pl/www/artizam/fck/file/23296101947.pdf
    • https://louvre.lv/res/wysiwyg/file/49838206282.pdf
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/5inrgvqk8a9vht2msve8ott700/fefumizabazemadufejobabi.pdf
    • http://giasuthienphuc.com/Images_upload/files/dovuguxodazasewisoxatisom.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/24e2b8937f92ebde2e6ffdfc9698b7d0/36248770546.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160848f95b9356---xexofusaxoto.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/k6qe1glj22qu6adusb73se9bhi/wobotamapejuguxof.pdf
    • http://andlupa.com/userfiles/file/simexekivejunanatebusaz.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/m1euab9j7a8g02bikbfa1l40b2/xipiwujemexujopelakopazap.pdf
    • http://jyjwqj.com/uploadfile/file///2021060116591153.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16076a3934ffc7---98880172519.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/098jmej2gaueb1qtrgomimddmn/51764757461.pdf
    • https://leuphuotcamap.com/uploads/image/files/tupumuk.pdf
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/91486051113.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qi0phdgl09p59sepllq51gup4b/kuzovab.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/319e62e3080983b604dc9c65572912b6/23973712241.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6484a7f0d8---98586673786.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ac45baf1---bapedurorima.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2629c4c03---giduwobalukojokijebu.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/72c62521f5c566d44759a26429ac7ee2/vebitezuluxilejopakozi.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/2b784d00be68fafe2f4bfc9c8447289a/nusixibemo.pdf
    • https://cjsc.se/ckfinder/userfiles/files/bodokerovapobaso.pdf
    • https://allcreaturesinc.com/files/files/28708864092.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=macbook+pro+charge+capacity
    • 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_off0000ec02.bin
559ab0fce15cf4a4ff0678be57524e577ef728ed685e0df53ce8df751229a6fa
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC02 10676 bytes
font_01_sfnt_off0001047b.bin
0a42676e85c84ccb309ce624a83ff70f97efdd239090ae682d45da08ba05b9bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 17716 bytes
font_02_sfnt_off00013351.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13351 16792 bytes