Malicious PDF — malware analysis report

Static analysis result for SHA-256 de240c88dfee3f8a…

MALICIOUS

PDF

81.9 KB Created: 2021-08-19 00:45:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 170694ebf76260b9436821ef0c091b6a SHA-1: dbb7af9c3f0f482466590aa7d9b242c36ab4291c SHA-256: de240c88dfee3f8a89b46ebead71079c25fef9f1f7eecd535e27cb5e3a273768
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous external links, many of which point to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document's structure suggests it functions as a link farm, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://drafthe.ru/uplcv?utm_term=radha+krishna+flute+ringtone+download+mp3+mobcup PDF link annotation
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a61a4ab0c27---jiborarezikemojunulib.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/3881189140.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/2e1d0cfa03a0a292793b914062e08ca0/28690692183.pdfIn PDF document text
    • http://laduses.nl/image/file/wobilaziboxusuxo.pdfIn PDF document text
    • https://topupdana.com/contents//files/67361073175.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kevowilasiw.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/f9d9cba2b5f0e0c05556b334144b8121/sewojazonerebiga.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/7fa8abce6ab36cb57be58aab816fc86c/vesurutog.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c4302736f---vagofakututidorudabaxo.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/96a0925a8fa1433d5c24b73b6aab89dc/7283922985.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/14a5lgsn3o8s69b22dmqo2uf75/74635848070.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/44f450594f9723a37aa78bb03d71995a/62283590115.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/67436809687.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/sanalokumumaguwibe.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/10008003773.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/galizexi.pdfIn PDF document text
    • http://elma1.ru/!upload/files/wibitovixirelivo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad0c32a3f---24483027348.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef0378db4a---81648180103.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/68184511875.pdfIn PDF document text
    • https://literie-depot.fr/UserFiles/file/69617618078.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d345015dd5d---10493136182.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/50081925378.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d46d4c7903---jisepiropelonekanolap.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB1 11704 bytes
SHA-256: a80dce6633ad8477c663f53894a8ffe149314dcd604b66c2bc99341287765eef
font_02_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16956 bytes
SHA-256: 22e1084ffedfaa7b431eb89f41996f888d96e42fd2f3929f24f2d18102769c9a
font_03_sfnt_off00012347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12347 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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