Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a1c7d943a98986…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 02:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 65452e7a492a060927129f456712c2d1 SHA-1: 26521cee4dfc0c5bfe563141b0ac79734d2bcf32 SHA-256: 07a1c7d943a98986e0717cb1d5040072969f1e52b075ac4fbc4420f8da7cfc83
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • 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://laborke.ru/uplcv?utm_term=united+states+pony+club+manual+of+horsemanship PDF link annotation
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/6f69f93854b50feb22b01dc492563be2/veborepevataseseperix.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bebcdce7e45---92906228372.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1f4c26e4f3d25e6cf98211e3bb47997b/mipep.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/20805910691.pdfIn PDF document text
    • http://saktigroup.in/uploads/kegawawufufuwaxidunexodin.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/sukuzimu.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/60e02dde9a3bc.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/iaprcc5dqautrhi2of48l86sb4/loduloz.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dfd508b35---79452693288.pdfIn PDF document text
    • https://beytarimcilik.com/admin/editor_resim/file/32421336414.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f64b7fe19c4---12936387624.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613739800fed4---babukifukururedeto.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/83726146871.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/kopisumexupagilexuvi.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///15720071034.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/5114187243.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/57509984824.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/65306629743.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/71924010061.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zanujunaxazitexeser.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/5f8a2df0ea76fd262649cfe4b75805a7/29882893363.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_off0000cbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 16720 bytes
SHA-256: 78fc0b99c804fab390be63a36decb440929a73d2396f16189dae13e93eca7308
font_02_sfnt_off00010f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F50 11244 bytes
SHA-256: 0c59d39feae34e1b7b1f58e0aa7373fcdeb06763d4a643d0acd70a4e2f42ae7b

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