Malicious PDF — malware analysis report

Static analysis result for SHA-256 e91de18f32f10ddc…

MALICIOUS

PDF

84.1 KB Created: 2021-07-03 04:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5c452685e55b188fbcafb99d251e147 SHA-1: 34112c51d49468cb32c6cd406019ac526f909145 SHA-256: e91de18f32f10ddcac6eee3928506d9a9a0d5d4195b3a385069096150ffe27ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/87ihdvkcstff9e47ovu4rhuvo0/gukezeguwizasesodi.pdf
    • https://lesfeesdelhetre.fr/upload/files/50828598943.pdf
    • http://ksklinika.ru/ckfinder/userfiles/files/jutoxaxerijorugisokovaga.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d8e24dcb---8969832534.pdf
    • http://zulaikhatextile.com/userfiles/files/lumovegiz.pdf
    • https://plentis.eu/ckfinder/userfiles/files/52418668001.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/g7it3otr8jvskl5mdaab96vi17/31470274565.pdf
    • https://vmwarts.com/ecovic/file/29487709530.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16091737fbe9e0---87304613322.pdf
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/a3e1e0ecf595b41a765a9bd71a87cf57/sitofeg.pdf
    • http://hzdshg.com/images/upload/File/5384034177.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074370ac7333---63244188323.pdf
    • http://omegapizza.net/uploads/files/37620275855.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160882707b03e9---84072364880.pdf
    • http://21cedu.com/pds/userfiles/files/temazipenuvosumizukaf.pdf
    • http://artecgroupservices.com/imagenes/file/17513246204.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea43c661c1---bexus.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a28190876c2---zegefigabagirarowigi.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b185d80254c---5343992717.pdf
    • http://www.jindatunnel.com/up_files/file/bolovupu.pdf
    • http://petra-dario.info/upload/datoteke/50764610480.pdf
    • http://2440027.ru/upload/file/ganonurigufoxenonisajejiw.pdf
    • http://albino-pitti.com/pub_img/file/lidikeruwaputorusolasara.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+cell+part+stores+material+within+the+cell
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8ec05577995fb3ed13c97d04a2397d05/soliwotokovejivapirexuzaj.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_off0000e65e.bin
f455653040de4ef1b4df33dcd438efd84f5c077960b8b3b23447772a2f744259
pdf-font-stream PDF embedded font (sfnt) at offset 0xE65E 10716 bytes
font_01_sfnt_off0000fee0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 16792 bytes
font_02_sfnt_off000116f2.bin
09bfa9f70136aa3d12d25f35a8601acbeac98d33872643f8281e03ac4ae7377c
pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16844 bytes