Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef74f916e80695e0…

MALICIOUS

PDF

85.0 KB Created: 2021-07-26 00:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3ee76cc255f52a6e128d82d0c593f23b SHA-1: 9d4bb197538c311acb0eaf9d6041e95545498f38 SHA-256: ef74f916e80695e02d59307d392083c4fbf64c9e29dffe2a63caaf24633a2ddc
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier strongly indicated maliciousness. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://tavaszitura.eu/userfiles/files/pibufovajokoseku.pdf In PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/319434f2863e00125700e6c2c067a59c/nawuvuxojirum.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d76173bf3c7---rakepedukerobalevowesosu.pdfIn PDF document text
    • http://d4sontario.org/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/jiwop.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3253cd579---50173677136.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/lixelusijexu.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070518513073499.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/josipemugopotarilit.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078d3f5e9d7d---98278418838.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/77057433538.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/6gf1tml5uihgtcdh0608egar61/75874848356.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/voniruzumigefope.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/44974247567.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/gst1nqb94rflnqe7g1rmftuoaq/xitimadogexetimutexo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7e36d7d92---kufukib.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/xivenovolix.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/r83de879dlia4p9nmj3htopn0c/10640151192.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/fa851dd6593434a18c9bf3dcd635d69e/36358777565.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/39897628761.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/58818602174.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/94fdef722cec0bf429b58832cca20759/movebezovavu.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608da0399549d---lavimugepavamukow.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/11492029163.pdfIn PDF document text
    • http://airsoft1.ro/files/file/66270290607.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/77556977864.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c1f33194---sotowufexokulupinofor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+spawn+helicopter+in+gta+vice+city+storiesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 17192 bytes
SHA-256: 217c5dfd96ac402c12d4998e2b183a0e7dba252d561dd7488dbb427f8596c7c5
font_01_sfnt_off0001148f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1148F 10908 bytes
SHA-256: 0d75f6a9c01f3b5803c4c276c05dbab288379a9e25fd21c29930a8a018aba96a
font_02_sfnt_off00012dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1