Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd81ac6887a0edf…

MALICIOUS

PDF

83.5 KB Created: 2021-08-22 02:30:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a25d19809a026fa0520970fb22691e97 SHA-1: 260a91622097a73e319b69eab4785b7a09f1eb32 SHA-256: 7cd81ac6887a0edfa70420212a3ec3c9e3279ba325deed3cfad555c74b9de1bc
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs that point to other PDF files hosted on compromised websites. The presence of multiple links to potentially compromised CMS upload directories suggests an attempt to distribute malicious content or engage in SEO abuse. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://synergyproperty.com/images/files/kiwidosisesopufap.pdf In PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c188036367---15381800682.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/e0fc80a34d3b4fabe605de1c07df44a7/54844588613.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4c70ee0eb7a9c0a13673bf0dddde6f39/7001460914.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/livowisirakilura.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/62806774216.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b45ece9898bf79120ecdf84bd515eff2/gukovuvatunimuw.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/fc43d966bde4b1bbef89b867d2a295ce/96249533780.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/ruvexewototulozurimos.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/dovebireru.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec14d800c6---fuzikepozuludurafoxa.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f49f1196b2---wumigujos.pdfIn PDF document text
    • http://mfahk.com/upload/files/97615517031.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce6cca8e022---vikitemegi.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/d8liko7rpfqnn1rl5fc2ukg162/wulaporimakukotesasifer.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/41122085645.pdfIn PDF document text
    • https://rovetco.com/userfiles/file/rosogadogib.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/xonivadutenesud.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/70229410366.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a4395233f---42422892257.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/lijudufejegakazi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9bd1c646b0b9eceb5bd0e523b39143b2/2962772954.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/57lgil3amjukcvaudji2c0b0vl/zakosavizurigomin.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/c9b785fd2ad66aa338aeedb4f2e5dbfb/daxajatopivavazogov.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ab1b79894---25272951719.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/nugebi.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/dejovobojijij.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/poronazimuvaraziloxodux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=shatter+me+series+in+order+unite+mePDF 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_off0000e1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BD 10640 bytes
SHA-256: 4f443e3d16baf275f4b2204ac9a8f4392ea8518792b66307cdf296969281a41c
font_02_sfnt_off000111e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E6 18020 bytes
SHA-256: 8f142aab59c7d7d59abc5a726d20923ad0158282bfbdb0b4ab86efa701f1090a

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