Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be45546307bd800…

MALICIOUS

PDF

93.1 KB Created: 2021-08-07 18:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51f3da0b0504b1c1ef7d86a7ab7bb179 SHA-1: 62529c7e8ecec94d3ff7e346677579a1f91bfd55 SHA-256: 9be45546307bd800fac1ce309dc689cc79bc208bd44277bf1dc98adfdf1d25f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body was unreadable, but the presence of a link farm on compromised hosting is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b550d07a9---wenirasidavuvop.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9798f8d47f---zukewixurumemofiku.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/bm0pghsl6mkoq7ierlckvf5kfp/musozugizuwo.pdf
    • http://asja-doll.ru/userfiles/file/98696435364.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/5c5e57f8fe65f5fa74a2616f11450ec0/nolejusuzewolasoguga.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/tuloxetobaxesewifiwid.pdf
    • http://szao-spb.ru/images/news/file/jeguziwetokinenuvatu.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b97d14687ab---wazefiragesugusu.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/tus4i7gpdlps055nrvi4ao57fi/pigedopabolonovex.pdf
    • http://wumag.pl/userfiles/file/wijimaruguranozotewi.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e637322a---86809803074.pdf
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/80099437a0983610aeca13439b50b078/9479559550.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/5c9ac49b265ef6e3b60377bc3b28ad1a/87111565325.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/bfa7f200bced66d6ecb66a6e95b9311a/dikisebejedewer.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/37d8359e1a51c71889994c98515a7781/74353594836.pdf
    • http://rwdwebwebdesign.com/img-aim/files/totazopekusexiliboni.pdf
    • https://szabobuszberles.hu/files/files/pudorefulerunip.pdf
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/34726396836.pdf
    • https://actor-conseil.com/files/file/noxuduzuj.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/160b520f4e746eb7b347283ee5188b58/xatitetitufimonikujir.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b24cf55d7e7---31608329677.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c28eadb0ddc---69192714904.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hidr%C3%B3xido+de+sodio+formula+y+nomenclatura
    • 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_off000104ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FF 16792 bytes
font_01_sfnt_off00011d16.bin
498a5173b7c778c106e800e82339aed2801db6c1fc83de35e7e122da1fe0b6cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D16 11084 bytes
font_02_sfnt_off000136a7.bin
2965e23ab1c3cc631accb26dc661def3282778cd6f13172211e5999caf46fde8
pdf-font-stream PDF embedded font (sfnt) at offset 0x136A7 18016 bytes