Malicious PDF — malware analysis report

Static analysis result for SHA-256 39d60a3f15af3d40…

MALICIOUS

PDF

104.8 KB Created: 2021-06-29 06:04:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7ff852801b7c746db488635061a38068 SHA-1: baf32f8a8ca93c330eeb468a9b8c73f3c45356f2 SHA-256: 39d60a3f15af3d404ce23eeacfce7f2154f7d6aba8ef58366c9d8e0e62e4effb
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, indicative of a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically an advance-fee scam designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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 http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eedbefd26---71045047751.pdf In PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0917ab8ba---zasexukazob.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608cde0ac9530---81847612794.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b803036f2ca---15985865610.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///megowigisagefarebirekelo.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/32485795747.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/08a181e2fc82aad2e0e3a11ef00beae6/jukurasabes.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/46099fca70abd93da48c5765ef55fe99/rojorujibevezevotufuviw.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/8lrr0rk5nfov41ok4dscf20qdp/85145336066.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/64292779107.pdfIn PDF document text
    • https://loctra.net/userfiles/file/fuvobozugusalatop.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/zaramujotavarofepedagelub.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/gatalugaxujopameletu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/sivufexak.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051609255378.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde72553cb6---vaxulikagakaweloximu.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/bavesiloxo.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4741d1da2a---totazarutujun.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e0517d4b---dinilikekoduzopisebi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8c4560e1---5649912542.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/65696541760.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/493fa726612c31626f5f81a67dbdce1c/xumajixokemas.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c557863141b---83503416900.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/83333950937.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5831b5df3---210714867.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=sustained+release+meaning+in+marathiPDF 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_off00013b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001535d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1535D 16300 bytes
SHA-256: 971f83402d28c14aea39b8224d9051ceb59631c5da8956ffd73c39643790e20b
font_02_sfnt_off00017d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D1F 10752 bytes
SHA-256: bd2fd50eb5c9228ab2b12b6e15028b6b8d9d33084b1bf6201b356435b6f5be9c

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