Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d7d1070759bcad9…

MALICIOUS

PDF

82.2 KB Created: 2021-07-14 00:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a312f5ddad9615f2f81c4201d0b0620d SHA-1: 5b53d73c71cf60ff5993c31fab64b4455ed59966 SHA-256: 7d7d1070759bcad9de7f23e166d08a3d796356788ce42daec96d6e52fbd0a4a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://medvor.ru/uplcv?utm_term=naked+browser+pro
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/4db62c5808599d3ed871335f754467cf/16263223157.pdf
    • https://unosms.us/userfiles/file/97257427801.pdf
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/bepodakijusazojonufake.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c4f1dd0d8---wureluji.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/94921a3c91b5b2d2f3ad16cc1345ac6b/98291592220.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/q2r9g2bkdomt8s9jap27c6scc0/zapepafo.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cadb381b2d0---47307596651.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/16081173453b81---94882739651.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/soulaunpvkn4t5usuq4hfn6na5/58404783714.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/4ce69ef136f36baa941703e3a66c1732/xixuwunofuvipod.pdf
    • http://tv-sat.cz/userfiles/file/kulejurizikiririjokatomud.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc85858423f---namadefowafefex.pdf
    • http://alliance-ic.ru/uploads/file/27206672450.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/gnv5dlf78ld7ae2olq10b5u39h/54989300056.pdf
    • https://pakianco.ir/data/image/uploads/news/files/1668122190.pdf
    • http://qianlong99.org/ckfinder/userfiles/files/55620538711.pdf
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/l6572ovte0okc1e2urh9ju9qn5/65906722841.pdf
    • http://anatolianlgs.com/userfiles/file/65441813519.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/67329228241.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sj1p4da5qhfkjf21qd6tfih52o/ritatop.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf72decd56---43692118509.pdf
    • http://vita24h.com/uploads/userfiles/file/kasetagup.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1c42b6c8a---mefola.pdf
    • https://www.haievent.com/wp-content/plugins/super-forms/uploads/php/files/h27mmiob4b3a7ja5ltlgka1p3o/rajokexesu.pdf
    • http://pathtojanna.com/userfiles/files/9085934790.pdf
    • https://rajakeempat.com/contents//files/sufolalirup.pdf
    • http://dlt-nkp.com/fileupload//file/rosumokifinetegepebexe.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5b836b5f7f---52905424531.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_off0000defa.bin
e0585950fc9d57f62be06a6fe966732fa75fe5e20f407445c7b21ea887f8fb03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 17144 bytes
font_01_sfnt_off00010c16.bin
8c558e54b761c4aaad55b483615a6e3081e4e2ff14ed4c908106dee4acc3f0b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 10340 bytes
font_02_sfnt_off00012364.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12364 16792 bytes

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