Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d186bf5c488632…

MALICIOUS

PDF

77.1 KB Created: 2021-09-07 02:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4fc99289c0be87b1009a725f189ef2ef SHA-1: 6f689196cbd324ea80087b8a3c103fb48b922461 SHA-256: f3d186bf5c488632b49f24af3bdf177b3e85e41c1f71f7a5d0f3521570020061
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to lure victims to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=composicion+quimica+del+petroleo+pdf PDF link annotation
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/33777765235.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/84101277454.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/83c195fcf54ade67a0e7690c90fe18e5/pajumogamavofakefile.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/a5939c621d3d69cb62f8d2caeb46346d/fomejawodewinukoxiduf.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160beea45a7e74---luwifenutanopovaduwatiwo.pdfIn PDF document text
    • https://0900107678.com/upload/file/degoji.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6c98e75a7---riwiguxenuva.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa246a11f43---61314923518.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/32329171510.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/74053423173.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6f2f7c277---3030572263.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/cd81a3a649968f073e3e384cf73a5849/tonimemegiwebalov.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/46db756c193686bc3d42daa885131743/67654041408.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0e573c4a---rasalesajurobulajadu.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/71114933645.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81da2942b0---85584779584.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa9e36e0866---fufexubivetudivuwiza.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/00laf7h1qdm6b4gpflnga6ks5b/90516476513.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608a45f06ec1b---lojejijijaje.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/40263534579.pdfIn PDF document text
    • http://tdbm.vn/upload/files/79432747395.pdfIn PDF document text
    • http://martonelektro.hu/files/file/tujivozosoderi.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/rowelisoforodajuwejumajor.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/6557120914.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_off0000c206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1D 11056 bytes
SHA-256: dcdaff4891defbf3390aefa3dd2370ffecc8c2c857b02db1566b957ab6076340
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 19320 bytes
SHA-256: 565a79dcca47db2a5b19b70ae209daa57c67a2a77c54b930be55d4257a4f1cf0