Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1777d129dbee8e9…

MALICIOUS

PDF

76.4 KB Created: 2021-09-07 20:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 97b5bd1f48fb4fa4536348fcaf765e54 SHA-1: edc8b45867e0555e5da920f1ac6f5a7649f8b543 SHA-256: f1777d129dbee8e955bc15888540fe1fad555c36844c730cb6d81ea7cab0276b
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. These links are likely intended to lead users to phishing pages or download further malware, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://condominiobrisasdelnorte.com/userfiles/file/75889106250.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7aff847f48---17456187004.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/77237626103.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/7377217904.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/41681660758.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/16295e22677b24fa848e7b6da246d078/98291162.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4c43ce462---lifobonifeduwe.pdfIn PDF document text
    • http://dnepropress.net/files/file/pepugigawasivunixumurij.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/sajotumefofixet.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/refobojidezuma.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/sumokagoluxuguduzu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/39vr61k61f387va68mgfpu5n0l/misenivudapovu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b30a6ecd7e9---tegesilasisojibilake.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/be4480bcb70edd1b8d3cb632650da6d6/donuxilogokotakexinut.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/fopokeserozaposejet.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/metuka.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/81218596970.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc58007cd3---70727728179.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/fubusamipanogizekasodo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/xepexolamejisipi.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/29f60cfe5ee6af64b332335262a69f28.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=isosorbide+mononitrate+er+davis+pdfPDF 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_off0000c732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC732 17252 bytes
SHA-256: 0ec2ba90d87e707526756624b4a665dfa4881d16c6aeb4327f85ddd0afd15073
font_01_sfnt_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 10768 bytes
SHA-256: a51effde10eb9db0ded8d9ba613d1fa3673a46d991126869a0ef0a005a06ed02
font_02_sfnt_off00010c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.