Malicious PDF — malware analysis report

Static analysis result for SHA-256 622f1886cd134bfd…

MALICIOUS

PDF

90.9 KB Created: 2021-07-14 00:30:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9574b097f12e2ceab193d740e3be9d6e SHA-1: 68defd96cf0a7a35dc2da51d7e5940457580411a SHA-256: 622f1886cd134bfd77f0fa6ce92ffe682afcac91ac30dc5831e3fcf6523c5663
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The PDF structure itself does not contain executable scripts, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/fb132b2ac8eadc19b2ecc20a1f6181f1/15782764176.pdf
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/5c903a8eec92888b039c30582bbb1356/jadudikiv.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/3kn9d28k1pr2ac8cue30asi5u0/dugixosefeduzufiluga.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3892bb2bc6---xagowatomered.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/0737912dee2599c059935b992fa58e4a/15103842227.pdf
    • http://akinmedikal.com/uploads/file/gimawisugevedogopatod.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/aec2b0d90566f99339e18fc5c3d38db0/95838424394.pdf
    • http://s-privod.ru/userfiles/file/wijita.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b448b4bb2---62295375257.pdf
    • https://paidionresearch.com/userfiles/files/64780801678.pdf
    • http://dianacb.cz/userfiles/file/86008741559.pdf
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160714ee263ed8---40092381127.pdf
    • http://monkey-do.net/userfiles/file/linujawofodajo.pdf
    • http://polyalpan.hu/_user/file/23808776387.pdf
    • https://sealskinz.ru/files/file/12068560167.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cd7913a9e6c---73735036291.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/be242e6f83189556ee36bbcafb585e7d/fabedumutapo.pdf
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/da20ca6c83e58b53f73acd6f528c8f7f/bisirawuga.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/34122123820.pdf
    • https://nacionalequipamentos.com/ckeditor/uploads/files/98437366835.pdf
    • http://www.aluvascientific.com/UserFiles/file/zikibedefesaji.pdf
    • http://sosnovgeo.ru/userfiles/file/23258777338.pdf
    • http://domingo.hu/ckfinder/userfiles/files/limolasatal.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/9a158dfc111337ca16909d533b71c2b3/kutokibakiwinevitonilo.pdf
    • http://bularz-auto.pl/images/userfiles/file/dozujajidutetiratazi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=family+fortunes+big+money+questions
    • 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_off0000ffee.bin
2fe333021176430b04faad6e4eb737701a4ec9f475d0ec3140310cc0d6e4527b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEE 11032 bytes
font_01_sfnt_off0001194b.bin
911e1b5799c2027de639088ef2b68b0e774e2d50855907a9d319cf762b69ea6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1194B 17192 bytes
font_02_sfnt_off00014629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14629 16792 bytes