Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e7cdc058ff29617…

MALICIOUS

PDF

84.3 KB Created: 2021-07-16 18:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3043327cc452a44b3e01facd413887de SHA-1: 54eed62aa0f80f654a966ce28846b4a855e50e0e SHA-256: 5e7cdc058ff29617e1cc4bff036bd8020971b1840c57bc12f6a9eb3d1b175f02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, pointing to numerous compromised WordPress sites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages, serving as a distribution mechanism for other threats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/l7nlb65uutl4luqo48c3hf1d21/misadufo.pdf In PDF document text
    • http://www.jindatunnel.com/up_files/file/28903267174.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d28d814c5---numakeze.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/32501958311.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/716fbc8fc579aba32bd5d5a84153f84f/jafubunuxoxesuvo.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/labitemavilijadimubibol.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073983b0ed12---99413335854.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac3b86d13b---75940212170.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78990243c7d0a25510d412181b8f6dce/33200857024.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/tabuwefezugefifilok.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/nopijijiwexezemab.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/icsn77qta0i5q00kbvgeq3af8j/solesifiginaru.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/14134656018.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/ximabed.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/u7dme2j2pkaau2eqjgtc7fjnhe/nizafiregiwar.pdfIn PDF document text
    • http://labonscafe.com/userfiles/84353025500.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/62876201347.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0758c71bc---3009841317.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/5ptq8ajpmn9tdj0o3107m53o10/35181321424.pdfIn PDF document text
    • https://tavio.ru/files/file/82347849094.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/vemiruzifojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+together+or+altogether+in+mathPDF 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_off0000e81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10031 10368 bytes
SHA-256: e2871b3acbcd082fcf14b999d82d7f8c3a8507dd99782436ef006a8732109be4
font_02_sfnt_off00011764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11764 17092 bytes
SHA-256: 1710306d0a14288b861f24ccf9f56a1b5f2c6d8cb9b06c7967284b92503d28c4

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