Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9042836ae0b5911…

MALICIOUS

PDF

122.4 KB Created: 2021-08-14 18:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccbab057f0b8f20a56cac385220a1bda SHA-1: b8b021fdb9ba6f69ca011e2db6082b482ef1251f SHA-256: d9042836ae0b5911ce307e00cda3cca5e3bfd01f6fdf670d0b86acf849f32515
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://aashianarealty.com/file/lekolesovunufabesilitugol.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fee934f90---xutapun.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/88076448681.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ada8c86f3---84261039462.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/85713930993.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/12315633898.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/bapurusix.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfff13c798c---ralonazapina.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/36569411821.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/624a58dc9e52f55f07c0f9f90e04d5df/fomezamek.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6257bde939---gulikuzituwubepuke.pdfIn PDF document text
    • http://redactron.com/userfiles/file/85715533601.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da3712f3062---papowi.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160770eb12aa5c---kabuzoxazumub.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/jetezusegonunajif.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/1b6e1f67821e6ed93f6ac000d5dea7f0/ranozujofofixito.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/8437689c7fb3bfe39046ea14d4b901cb/53016551333.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/47989350040.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/38205f4f255a769104de8c62ef571710/94199851967.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/20713783423.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ch1gf065qqj88s4kn4uvn6sgte/zeruxejemufofitomewamok.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608769f8c71cb---92888088531.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608244246471c---11450442211.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+many+countries+did+british+colonized+in+africaPDF 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_off00017b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B6A 11232 bytes
SHA-256: 043889ee231b34c90482b4a1a764c202bd7c9f42d56e7b24f836a384788503ff
font_01_sfnt_off00019597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19597 17224 bytes
SHA-256: 6b899432ceb35638881399fd4f4ffdfcf62477f3fb9103ac4f93d2b78ccc81b9
font_02_sfnt_off0001c1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C1C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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