Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef280f804388ede…

MALICIOUS

PDF

85.3 KB Created: 2021-07-21 01:33:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 864d1bcfc54327c7cdb82d22a4daa1d4 SHA-1: 4a4567b51233e802c2d48e090f550d563f6ec6fc SHA-256: 0ef280f804388edee829b86c97f99225f83cddf2f28f7c8e87bdbb1d8410541b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many hosted on compromised WordPress sites, forming a link farm. The presence of embedded JavaScript and a high ML classifier score, combined with ClamAV detection as 'Pdf.Phishing.Trojan', strongly indicates malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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.
  • 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 https://peintures-descours.fr/fichier/files/rozekirowepu.pdf In PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/b09e457d569fc6e5abac93b23ebda878/winabomuzam.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/aoiqt5basbddske4vn1hn6vfmu/wubuwesafibemumedijuje.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/163b9d51e8d4eb0d4d653c7471d9319b/regekobidosujuju.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210513224434181.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/pp78j791tflsh9kq7920e7tgea/rawomas.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a7dce245b---titodoma.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076d81cc0619---55976128528.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d381a2d64d5---72409782626.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/27433693153.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b509q84au09aejpb9t1o3rkr86/79844523719.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/bizumigifapopakurorenubu.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/ddf956250a680edb5f331d5381c53002/majixuxogolubopopapu.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/gedotitomudebatelegono.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/25cb35dbedcd51d6a3c44deba0be89c1/lutaxedivafoma.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ad2992400---47047517278.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/66809667928.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/9ff289c9e9dd631cda0c3ef455877943/5782493885.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/12543150657.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607668c572234---24652533074.pdfIn PDF document text
    • http://waypl.pl/upload/File/17715046098.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/6124559071.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/dikomukoji.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa592fbf24d---dimizozujez.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/dakekosutezubonazedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=happy+merry+christmas+wishes+imagesPDF link annotation
    • 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_off0000ecb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB4 16416 bytes
SHA-256: 65834a63d7194dbaa8ff3c75c239aed7393ff3cd75306dba87825528dc4043df
font_01_sfnt_off00011717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11717 10744 bytes
SHA-256: 9c685b4c4bd08bc2d211ccdba4fe380ee72016f75ed9f6fec2598edf223b7e2d
font_02_sfnt_off00012fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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