Malicious PDF — malware analysis report

Static analysis result for SHA-256 870bc64b6311f0af…

MALICIOUS

PDF

134.5 KB Created: 2021-06-29 16:58:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9aa6f4f21013cd34401be5fce91ec180 SHA-1: 8cd69f672144d85e5761fdc18a3619b7edc0f94f SHA-256: 870bc64b6311f0afc9252c837c811d6b3323dbdcc606c3e6ac6bfe721e8e3b63
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate 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 0.9925

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://oniceh.ru/uplcv?utm_term=navy+selected+reserve
    • http://ubest.ru/images/file/posiwazus.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/ffafc63e881a4020dbda1676c01ec52b/32511154334.pdf
    • http://airfa.it/userfiles/file/61730183205.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/ijabljre3snbd2ckf3nu1ghmkp/minenikedusadumi.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9b6160a67---82269410448.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a393bce625---87011651987.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a866fe2fd49---81043964761.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160bd10afa58ce---73005079843.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b4f3bf3d---88635443203.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/4f92d68e42824fadc032c312cab9d4ad/40823132561.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ee54ea68---47227802421.pdf
    • https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/d77638cf8ebfb1fffd1e588595ca7ce1/95694695116.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/24a98e0472e34104ef1406f42edafd56/mugam.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/78086023497.pdf
    • https://digireg.se/upload/ladupowajifazufakifawexi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/21q47motrf0thol30d7lr15k37/33207845068.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa250d1b84---26535455570.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/bs3knlovl150ijv64jk1j6c367/fovasikarojoz.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/992459178589a3c4e3cba3fdc1566a27/faximadilad.pdf
    • http://runo34.ru/attachments/file/23087132721.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3e99c8cfd---77544830256.pdf
    • https://akapacha.com/userfiles/file/78530627070.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/e0c6d2ecc388ce134ce39c0397cd9bea/jibagunijakikokoji.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_off0001aef8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1AEF8 16792 bytes
font_01_sfnt_off0001c70f.bin
2dd2ba32f2df6d172f4fb983d2c22ce344135cdc28b7bd66225ba651552dccdb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C70F 10204 bytes
font_02_sfnt_off0001de1e.bin
76126bcbc7335a2cd32fff85cb67fe3d7b7dbd1b544221928d673b0362f9e6d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DE1E 17724 bytes

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