Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7ed4763fd84b0c0…

MALICIOUS

PDF

82.9 KB Created: 2021-07-05 15:46:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a979f4973b36a17c73ca1d8efcaa7431 SHA-1: fe6d1b1188a304a18669c42d8532ecf39c15e022 SHA-256: d7ed4763fd84b0c0750c43a67ba5879b5d3a45014850329e48a39ea023a8080c
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85e61ee21a---kesenolonixajikerusun.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc39bb612b---10370299203.pdf
    • https://coil.hk/upload/files/22801299455.pdf
    • http://www.annaleehuber.com/content_files/file/21679696411.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/578b0c90085d9af62ea8ddf46d4e13f2/40125132077.pdf
    • http://fiumaradelsossio.it/userfiles/files/toxezokarem.pdf
    • https://weyergans-hcc.lv/userfiles/file/wuraxizujobaxu.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5b3ff12b3---21372360044.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce399fbed89---modakenojuwipazum.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9c8f2c31e---26690259665.pdf
    • http://slstudio.it/userfiles/files/nabavolemovol.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086267495b45---82510065633.pdf
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/bapusewebimirinakibogeb.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b3ed93b5---wadoladakogotemavoj.pdf
    • http://kajsanordstrom.com/userfiles/files/ravavodaputopaxosova.pdf
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e200ea6912---99888816972.pdf
    • http://parcfamilyreunion.com/clients/b/b3/b3ae52aef0329bb57e848b27182677c8/File/fujaxuru.pdf
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/86041788018.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609531171095d---86694416563.pdf
    • http://www.victoriousintl.com/new/resource/files/jikuwipatude.pdf
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/fb9238f68a2f9a633781861a73a35b38/75544811411.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fe1bb9357---ligofefazagedeji.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ipjktf89su04jtgrgq8j3ir42/45052700889.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+draw+food
    • 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_off0000e54b.bin
8597c22ad1cd19db90090eec6be9f063104e5f14f22e26ced8d1a558ae478878
pdf-font-stream PDF embedded font (sfnt) at offset 0xE54B 16624 bytes
font_01_sfnt_off00011087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 16792 bytes
font_02_sfnt_off0001289d.bin
3bd87d7365131268719274449b86d1ff2e9aa422cdcf474e5d4b478210576b47
pdf-font-stream PDF embedded font (sfnt) at offset 0x1289D 9884 bytes