Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d244237e78e803a…

MALICIOUS

PDF

80.9 KB Created: 2021-06-20 23:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0468ace303c6525dec86c1faa9b02648 SHA-1: 0412928e628af9a934bc20d1697f77933278fff1 SHA-256: 5d244237e78e803a4883dcd1b79565d16c2fff830dc82b5c119ea18e9c58a93f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations. While no scripts were directly extracted, the PDF structure and link farm behavior suggest it is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5915e5099f---73621518453.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b2c2efd984678e6c1b5a521c670e4da7/mugik.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c234123fe20---69941649342.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e625d37b98e8d40e3bdba70aac3b59e2/21595546840.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/b6de43f575a679c2937db7eee9b35c69/fobapiperojudobamoz.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/8ef0f1a4ffba4bf55233e8f086ccbd37/36160740064.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/jibigufuwadipog.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/71534312112.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8351613b83---40367942015.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/b292ef5bf9f66846ae4d3f354c2dc1cd/gagab.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160794101a18d2---lavozipajutibisej.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c09c4aa7402---65011259878.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d77fa48be4---9546645897.pdfIn PDF document text
    • http://bouncebodysupplements.com/newerac2c/userfiles/file/41640473975.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609277a7d2968---wovor.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=sets+worksheets+for+grade+7+with+answersPDF 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://scripts.sil.org/OFLIn 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_off0000e397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 5476 bytes
SHA-256: cbb3a7f446e03b5064754afdabc7462eab8d4609f3692197e61e4130c0b41973
font_01_sfnt_off0000f649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF649 11716 bytes
SHA-256: d776d1bdf84067d9900d6dbd6c4d06b98668fedff54f3b543c000bcdb4c7bc0e
font_02_sfnt_off00011e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E28 16956 bytes
SHA-256: 4c0bb466b069730c63d8af30214e97ba3b03452992e732be2c48f0af882fdecf

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