Malicious PDF — malware analysis report

Static analysis result for SHA-256 04fb18d9038540e4…

MALICIOUS

PDF

272.5 KB Created: 2021-06-30 13:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ba095e0333b5f1b63b1fff9f79207f4 SHA-1: c31a8e327736bba729d28d8dce52b39645fc60a5 SHA-256: 04fb18d9038540e4213aa2b6af683e33c736f1cc18d15f75800b2099b96aa00f
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a high-confidence heuristic indicating a link farm pointing to compromised WordPress upload storage. The ClamAV detection and ML classifier further support its malicious nature, likely serving as a phishing lure or a distribution point for further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9200

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kengosushionlineorder.com/uploads/files/84314756530.pdf
    • https://observatoire-omic.org/documents/file/44093825242.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c4cac498a---tinomaje.pdf
    • http://csptech.net/admin/userfiles/file/50539289282.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fa1c21fb---46738436961.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/640e092f4357b94497fe8742f2f0f41a/1311116153.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160713f5ded73c---1166675538.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160976a3f1ed86---zuketesodabelalowav.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092e7ed25a29---betirajenokukedotamilem.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24fdec22a---37108116335.pdf
    • https://bestcoloringpages.com/userfiles/file/kinalitok.pdf
    • http://alfavit.tv/userfiles/file/wevimosutotalevojes.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cf07de4652---vaxedejukalegegujedixero.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eb1076b52---38857391237.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160708671ca511---zuxeva.pdf
    • http://webinaris.net/ckfinder/userfiles/publics/files/59921938772.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dcc6650eb---97990895017.pdf
    • https://designclarf.it/file/78946150901.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/bj8c1difrksug7fk67358b2mo9/93167564945.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160748d173d5be---polex.pdf
    • http://albatrossmrn.com/konadnew/userfiles/file/supoxa.pdf
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16072b83f598b5---xevawotixegikalesejedivab.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=solutions+of+triangles+class+11+questions
    • 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_off0003caaa.bin
3d8348aa441b3d2ec6def7899f27a07d695918b7dd1cffae58b7304e2061ed80
pdf-font-stream PDF embedded font (sfnt) at offset 0x3CAAA 10884 bytes
font_01_sfnt_off0003e3ad.bin
8049cfb503863dc956fa16158c87e49caa517134edbc1e9fe3f2edcc976f824f
pdf-font-stream PDF embedded font (sfnt) at offset 0x3E3AD 19840 bytes
font_02_sfnt_off000418cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x418CF 16792 bytes