Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38dca0b276de13e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-02 23:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 45d552fab9a1730e423881dac24912d1 SHA-1: 7477213832b4f274bd4f5dde25d7445aeac7367b SHA-256: b38dca0b276de13ec5c193f4383dabb2dee8cf909d5e237417b51f403619cd1d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to lure victims to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://eviljoy.com/UserFiles/File/sugefowekojej.pdf In PDF document text
    • http://samtekelektrik.com/files/44431015129.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5cd4c0cfcb---81943806557.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/17658431250.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123c04058e3a---89284467842.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/91823482519.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0669380866---tadisivafegef.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/73731506213.pdfIn PDF document text
    • http://vbs.pl/dat//file/meduvabapuwizedenok.pdfIn PDF document text
    • http://indecomavo.pl/inc/wanowosu.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/27434669439.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/gizunu.pdfIn PDF document text
    • http://anshan56.cn/userfiles/file/16260995471839942587.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nuwabepanazi.pdfIn PDF document text
    • https://baoholaodong24.com/userfiles/file/31216211994.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128d60c6dcd3---80499556637.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/fabup.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/wufunulenumozufejup.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/90386457576.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/94084051842.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/65589224283.pdfIn PDF document text
    • https://12shio4.com/contents//files/josumupezobivavabiwevodiw.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/84598714b4f2c6360a1e7af4ebcf5d70/79980813587.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/66e405ed0fd3cc1819d3aa4d6035b95f/webenijifotewujajo.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/31cdbc4afc56ea02d151d9cc7c201986/85504273051.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=2012+jeep+liberty+owners+manual+for+salePDF 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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11288 bytes
SHA-256: 71226e78fa1bd7d217120be93c083b66a90813e24fd5958243b4d99819ccc15e
font_01_sfnt_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D12 16636 bytes
SHA-256: f0d54c0331d7c12632007dbf6c6a286060b41009e831deea848f5f8c755c9656

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