Malicious PDF — malware analysis report

Static analysis result for SHA-256 121f34a8f699d4a7…

MALICIOUS

PDF

85.6 KB Created: 2021-07-25 13:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05dd1193a3151f69313a5b39545ba4cb SHA-1: 8de61792755278a1d1afe46a17af15931d392928 SHA-256: 121f34a8f699d4a7c20b337bcb4627f8171de00b248550ed31a8be133ef79289
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing formcraft plugin uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a831f387f51---suzajapamoserufemikewenid.pdf
    • https://organicfertilizerproduction.com/d/files/rokefatowobukamezikuzojik.pdf
    • http://davidlbrooks.com/clients/868292/File/kanalirepegudiwetokinezig.pdf
    • http://richfieldhighschool1969.com/clients/868116/File/2433413122.pdf
    • http://adabaskimerkezi.com/upload/file/20529587182.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/ccmj1v5ag1gurqu3be8vgmk4mr/rumaguredetel.pdf
    • http://stin-verdon.fr/assets/Image//files/1232573723.pdf
    • https://gikguamerica.com/userfiles/file/36393078421.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b44f1b051a2---kevobutivasig.pdf
    • http://goodwill.pl/userfiles/file/fupowujeparal.pdf
    • http://master-sign.ru/ckfinder/userfiles/files/38946625035.pdf
    • https://asiabiru.com/contents//files/rapewotodabajikivifik.pdf
    • http://yilip.net/userData/board/file/54342661909.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af8266b511a---mawotik.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075899553523---66792036083.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f38d0b1db---86083209574.pdf
    • https://ludifrance.fr/userfiles/file/63905155555.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0kismt8tl9n2ad3ehs7vcr1ih0/21013169554.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e8076163f28---dajapizinegatoxazu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+things+algebra+gina+wilson+answer+key
    • 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_off0000ecbb.bin
eee1a46a616e001b202fdc5e0abb229c06f3bdb7c569a6034bad6f801f5ab4ee
pdf-font-stream PDF embedded font (sfnt) at offset 0xECBB 16376 bytes
font_01_sfnt_off0001171f.bin
3505a28c153258aa4a7af906d27cb14c3a0c6b20e55ec5beafd6c95ca4965ec1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1171F 10800 bytes
font_02_sfnt_off0001300d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 16792 bytes