Malicious PDF — malware analysis report

Static analysis result for SHA-256 135fe0613325a98f…

MALICIOUS

PDF

88.3 KB Created: 2021-08-08 12:36:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d458764431f7440177d3650555ed7ec6 SHA-1: cd3f46fbd02ec92eba6a208a9128ec61a914cb24 SHA-256: 135fe0613325a98f1578b9bd2f1902e54670f1f0ee19fd7a8def11d182d7d339
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or SEO abuse. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential exploitation of PDF vulnerabilities or embedded JavaScript to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/mk59aldu4jjk8f160j1er1eai2/nupodixevijakoxawobusabeg.pdf In PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/adbd7758a48fed8861ea245650785006/mesajisusabotabeva.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/96295329563.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/75230557461.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/vedevoj.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/94262049618.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/rasut.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/94319896496.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/84841636522.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/76305512139.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/81bsjf817jbfmkam12jr44iva2/38743672746.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/34702330281.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9823143ed9b7404db3d69f81d68683af/fizoxamafowanazab.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d84f0c1a7---87356978472.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/0t6q0a023v0ncssqpvv2ofa1kh/97675118298.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/cf36666d6a169d229a94c2ea850b248f/mewiwenebiwezaz.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/1d9754f34dfa9cd445ea0ed113182a45/buzasedovupobimisuluwu.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/pekepu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/62926212301.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9824ae02a7---zezem.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/jajox.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff5ac52018---68701553540.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/manujulizamubalajubezut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=internet+speed+meter+pro+apk+rexdlPDF 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_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF5 10608 bytes
SHA-256: 3010a99d597a781e95d4bb92fe1dc26de9a8a4fd1de115ee3cd209baef0ab4b9
font_02_sfnt_off00012536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12536 17692 bytes
SHA-256: 3ed2d3ff5dd66f702fa1180ed476e91375c09b160a4079ae816cd566f9b4bb2e

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