Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6b2efaca593e1af…

MALICIOUS

PDF

84.8 KB Created: 2021-09-05 02:11:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09c70eaa5a37411858a990039c3d0d64 SHA-1: 016b4ff01b35129b3f7a7262ec4b633c74da8677 SHA-256: e6b2efaca593e1af55e0d801b82589621931e0255e115c798e25c8f828da7ec1
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=agathiyar+thevaram+pdf PDF link annotation
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sezegarabafapejagevako.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7a988bf5d---sigevoborudim.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610075240fb9d---vadafofokes.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93126537e---78978561377.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/gcbr5r457v3aqhmo07u5oqjvk4/16471153573.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160feb48b7a0d4---nuvudenezolikisawo.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/15626047775.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/devefiganu.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/govexokutu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/gt9hqvbghbg96mt14u5d106ktp/28116549361.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/jvklqs5p5hgml205p085i1nr4l/42583696114.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a48ac3bafe2---vetedalurubumevapep.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/26952330985.pdfIn PDF document text
    • http://scsytech.com/upload/files/70478437946.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/kifojixawitugifivageko.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/mavepunezuladede.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/16384977435.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/suvovuvuweruragafikure.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/27048792774.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/94aa62bea770d93978d10e001e4475f4/nebupigavupevadarefove.pdfIn PDF document text
    • https://bamor.org/userfiles/file/fevusinubom.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/fubeketaripum.pdfIn PDF document text
    • https://afayl.com/userfiles/file/63791254729.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/kiwifudopirul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 20088 bytes
SHA-256: fa444d52fb35530bce0e2e980cfa9111bef6d055acd5f6eec0e41ef5a7a434dd
font_01_sfnt_off0000ff42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF42 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f
font_02_sfnt_off000114eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D02 10668 bytes
SHA-256: 912eea50d15be4b1de5f7e63003dbdea38583060c9e129795e0564083816d8a7

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