Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bbf82096e0a5a0…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 05:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8e83607039a43be3a00b08450bc7ecaa SHA-1: 9047581d4621ba51e1a569462334f540d6b3f078 SHA-256: 54bbf82096e0a5a02c2a2ae3e13b069e2ee333414c325e58c016bf40fa869e3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it's designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself is used to facilitate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://catamma.ru/uplcv?utm_term=worm+gear+mechanism+pdf PDF link annotation
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/vcptuc49qn5o19vn0u4ijtetk2/bozunudirezatezerekire.pdfIn PDF document text
    • http://ubest.ru/images/file/vewabuxejozuxovipok.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608023019b66f---pukekakanikotumadovi.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h4k3ut64e56lvch8r9kl512u7o/megeduxi.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6e98294e9---86227568051.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/motofizodilozavinolovajim.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wawiganegilubunidoroguwuv.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/9382349064.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/84742200415.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c68b3a087e---32814415877.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085d337e57a4---61958538487.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/16588770376bcadf81a294cf748fc46f/77985967991.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e99f615f2c---mubatexesozukisuluwejofo.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/16149869299.pdfIn PDF document text
    • http://tdfinalists.ca/clients/43449/File/zosijifapalukanajineg.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a65b969ddc0---56785157562.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a71ffe0e6b2---vurevosixubenidepi.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/peduge.pdfIn PDF document text
    • http://regcureguide.com/files/files/39385312046.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210819112418.pdfIn PDF document text
    • http://centromp.it/userfiles/files/30240224799.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3675b0565---fesolawejitimikozokuro.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/63259495771.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/dijumitowaruwukak.pdfIn PDF document text
    • 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_off0000b59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59E 10916 bytes
SHA-256: b5ae96978b8d3dd52e508accfcd470ef020398644fa3062ea46bf54642830876
font_01_sfnt_off0000ce7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7B 14740 bytes
SHA-256: 414d47c00cf4527f0185d75b210f420ea473395cd0d0b5592474863b01fa385c
font_02_sfnt_off0000f37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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